qcodes.dataset

The dataset module contains code related to storage and retrieval of data to and from disk

Classes:

`AbstractSweep`()	Abstract sweep class that defines an interface for concrete sweep classes.
`ArraySweep`(param, array[, delay, ...])	Sweep the values of a given array.
`ConnectionPlus`(sqlite3_connection)	A class to extend the sqlite3.Connection object.
`DataSetProtocol`(args, *kwargs)
`DataSetType`(value)	An enumeration.
`InterDependencies_`([dependencies, ...])	Object containing a group of ParamSpecs and the information about their internal relations to each other
`LinSweep`(param, start, stop, num_points[, ...])	Linear sweep.
`LogSweep`(param, start, stop, num_points[, ...])	Logarithmic sweep.
`Measurement`([exp, station, name])	Measurement procedure container.
`ParamSpec`(name, paramtype[, label, unit, ...])	param name: name of the parameter
`RunDescriber`(interdeps[, shapes])	The object that holds the description of each run in the database.
`SQLiteSettings`()	Class that holds the machine's sqlite options.
`SequentialParamsCaller`(*param_meas)
`ThreadPoolParamsCaller`(*param_meas[, ...])	Context manager for calling given parameters in a thread pool.
`TogetherSweep`(*sweeps)	A combination of Multiple sweeps that are to be performed in parallel such that all parameters in the TogetherSweep are set to the next value before a parameter is read.

Functions:

`call_params_threaded`(param_meas)	Function to create threads per instrument for the given set of measurement parameters.
`connect`(name[, debug, version])	Connect or create database.
`do0d`(*param_meas[, write_period, ...])	Perform a measurement of a single parameter.
`do1d`(param_set, start, stop, num_points, ...)	Perform a 1D scan of `param_set` from `start` to `stop` in `num_points` measuring param_meas at each step.
`do2d`(param_set1, start1, stop1, num_points1, ...)	Perform a 1D scan of `param_set1` from `start1` to `stop1` in `num_points1` and `param_set2` from `start2` to `stop2` in `num_points2` measuring param_meas at each step.
`dond`(*params[, write_period, ...])	Perform n-dimentional scan from slowest (first) to the fastest (last), to measure m measurement parameters.
`experiments`([conn])	List all the experiments in the container (database file from config)
`extract_runs_into_db`(source_db_path, ...[, ...])	Extract a selection of runs into another DB file.
`get_data_export_path`()	Get the path to export data to at the end of a measurement from config
`get_default_experiment_id`(conn)	Returns the latest created/ loaded experiment's exp_id as the default experiment.
`get_guids_by_run_spec`(*[, captured_run_id, ...])	Get a list of matching guids from one or more pieces of runs specification.
`guids_from_dbs`(db_paths)	Extract all guids from the supplied database paths.
`guids_from_dir`(basepath)	Recursively find all db files under basepath and extract guids.
`guids_from_list_str`(s)	Get tuple of guids from a python/json string representation of a list.
`import_dat_file`(location[, exp])	This imports a QCoDeS legacy `qcodes.data.data_set.DataSet` into the database.
`initialise_database`([journal_mode])	Initialise a database in the location specified by the config object and set `atomic commit and rollback mode` of the db.
`initialise_or_create_database_at`(...[, ...])	This function sets up QCoDeS to refer to the given database file.
`initialised_database_at`(db_file_with_abs_path)	Initializes or creates a database and restores the 'db_location' afterwards.
`load_by_counter`(counter, exp_id[, conn])	Load a dataset given its counter in a given experiment
`load_by_guid`(guid[, conn])	Load a dataset by its GUID
`load_by_id`(run_id[, conn])	Load a dataset by run id
`load_by_run_spec`(*[, captured_run_id, ...])	Load a run from one or more pieces of runs specification.
`load_experiment`(exp_id[, conn])	Load experiment with the specified id (from database file from config)
`load_experiment_by_name`(name[, sample, ...])	Try to load experiment with the specified name.
`load_from_netcdf`(path[, path_to_db])	Create a in memory dataset from a netcdf file.
`load_last_experiment`()	Load last experiment (from database file from config)
`load_or_create_experiment`(experiment_name[, ...])	Find and return an experiment with the given name and sample name, or create one if not found.
`new_data_set`(name[, exp_id, specs, values, ...])	Create a new dataset in the currently active/selected database.
`new_experiment`(name, sample_name[, ...])	Create a new experiment (in the database file from config)
`plot_by_id`(run_id[, axes, colorbars, ...])	Construct all plots for a given run_id.
`plot_dataset`(dataset[, axes, colorbars, ...])	Construct all plots for a given dataset
`reset_default_experiment_id`([conn])	Resets the default experiment id to to the last experiment in the db.
`rundescriber_from_json`(json_str)	Deserialize a JSON string into a RunDescriber of the current version

class qcodes.dataset.AbstractSweep[source]

Bases: ABC, Generic[T]

Abstract sweep class that defines an interface for concrete sweep classes.

Methods:

get_setpoints()

Returns an array of setpoint values for this sweep.

Attributes:

`param`	Returns the Qcodes sweep parameter.
`delay`	Delay between two consecutive sweep points.
`num_points`	Number of sweep points.
`post_actions`	actions to be performed after setting param to its setpoint.
`get_after_set`	Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

abstract get_setpoints() → ndarray[Any, dtype[T]][source]: Returns an array of setpoint values for this sweep.

abstract property param: ParameterBase: Returns the Qcodes sweep parameter.

abstract property delay: float: Delay between two consecutive sweep points.

abstract property num_points: int: Number of sweep points.

abstract property post_actions: Sequence[Callable[[], None]]: actions to be performed after setting param to its setpoint.

property get_after_set: bool

Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

This defaults to False for backwards compatibility but subclasses should overwrite this to implement if correctly.

class qcodes.dataset.ArraySweep(param: ParameterBase, array: Sequence[Any] | ndarray[Any, dtype[T]], delay: float = 0, post_actions: Sequence[Callable[[], None]] = (), get_after_set: bool = False)[source]

Bases: AbstractSweep, Generic[T]

Sweep the values of a given array.

Parameters:

param – Qcodes parameter for sweep.
array – array with values to sweep.
delay – Time in seconds between two consecutive sweep points.
post_actions – Actions to do after each sweep point.
get_after_set – Should we perform a get on the parameter after setting it and store the value returned by get rather than the set value in the dataset.

Methods:

get_setpoints()

Returns an array of setpoint values for this sweep.

Attributes:

`param`	Returns the Qcodes sweep parameter.
`delay`	Delay between two consecutive sweep points.
`num_points`	Number of sweep points.
`post_actions`	actions to be performed after setting param to its setpoint.
`get_after_set`	Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

get_setpoints() → ndarray[Any, dtype[T]][source]: Returns an array of setpoint values for this sweep.

property param: ParameterBase: Returns the Qcodes sweep parameter.

property delay: float: Delay between two consecutive sweep points.

property num_points: int: Number of sweep points.

property post_actions: Sequence[Callable[[], None]]: actions to be performed after setting param to its setpoint.

property get_after_set: bool

Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

This defaults to False for backwards compatibility but subclasses should overwrite this to implement if correctly.

class qcodes.dataset.ConnectionPlus(sqlite3_connection: Connection)[source]

Bases: ObjectProxy

A class to extend the sqlite3.Connection object. Since sqlite3.Connection has no __dict__, we can not directly add attributes to its instance directly.

It is not allowed to instantiate a new ConnectionPlus object from a ConnectionPlus object.

It is recommended to create a ConnectionPlus using the function connect()

Attributes:

`atomic_in_progress`	a bool describing whether the connection is currently in the middle of an atomic block of transactions, thus allowing to nest atomic context managers
`path_to_dbfile`	Path to the database file of the connection.

atomic_in_progress: bool = False: a bool describing whether the connection is currently in the middle of an atomic block of transactions, thus allowing to nest atomic context managers

path_to_dbfile: str = '': Path to the database file of the connection.

class qcodes.dataset.DataSetProtocol(*args, **kwargs)[source]

Bases: Protocol

Attributes:

`persistent_traits`
`pristine`
`running`
`completed`
`run_id`
`captured_run_id`
`counter`
`captured_counter`
`guid`
`number_of_results`
`name`
`exp_name`
`exp_id`
`sample_name`
`run_timestamp_raw`
`completed_timestamp_raw`
`snapshot`
`metadata`
`path_to_db`
`paramspecs`
`description`
`parent_dataset_links`
`export_info`
`cache`
`dependent_parameters`

Methods:

`prepare`(*, snapshot, interdeps[, shapes, ...])
`mark_completed`()
`run_timestamp`([fmt])
`completed_timestamp`([fmt])
`add_snapshot`(snapshot[, overwrite])
`add_metadata`(tag, metadata)
`export`([export_type, path, prefix, ...])
`get_parameter_data`(*params[, start, end, ...])
`get_parameters`()
`to_xarray_dataarray_dict`(*params[, start, end])
`to_xarray_dataset`(*params[, start, end])
`to_pandas_dataframe_dict`(*params[, start, end])
`to_pandas_dataframe`(*params[, start, end])
`the_same_dataset_as`(other)

persistent_traits: tuple[str, ...] = ('name', 'guid', 'number_of_results', 'exp_name', 'sample_name', 'completed', 'snapshot', 'run_timestamp_raw', 'description', 'completed_timestamp_raw', 'metadata', 'parent_dataset_links', 'captured_run_id', 'captured_counter')

prepare(*, snapshot: Mapping[Any, Any], interdeps: InterDependencies_, shapes: Dict[str, Tuple[int, ...]] | None = None, parent_datasets: Sequence[Mapping[Any, Any]] = (), write_in_background: bool = False) → None[source]

property pristine: bool

property running: bool

property completed: bool

mark_completed() → None[source]

property run_id: int

property captured_run_id: int

property counter: int

property captured_counter: int

property guid: str

property number_of_results: int

property name: str

property exp_name: str

property exp_id: int

property sample_name: str

run_timestamp(fmt: str = '%Y-%m-%d %H:%M:%S') → str | None[source]

property run_timestamp_raw: float | None

completed_timestamp(fmt: str = '%Y-%m-%d %H:%M:%S') → str | None[source]

property completed_timestamp_raw: float | None

property snapshot: dict[str, Any] | None

add_snapshot(snapshot: str, overwrite: bool = False) → None[source]

add_metadata(tag: str, metadata: Any) → None[source]

property metadata: dict[str, Any]

property path_to_db: str | None

property paramspecs: dict[str, qcodes.dataset.descriptions.param_spec.ParamSpec]

property description: RunDescriber

property parent_dataset_links: list[qcodes.dataset.linked_datasets.links.Link]

export(export_type: DataExportType | str | None = None, path: str | None = None, prefix: str | None = None, automatic_export: bool = False) → None[source]

property export_info: ExportInfo

property cache: DataSetCache[DataSetProtocol]

get_parameter_data(*params: str | ParamSpec | ParameterBase, start: int | None = None, end: int | None = None, callback: Callable[[float], None] | None = None) → ParameterData[source]

get_parameters() → List[ParamSpec][source]

property dependent_parameters: tuple[qcodes.dataset.descriptions.param_spec.ParamSpecBase, ...]

to_xarray_dataarray_dict(*params: str | ParamSpec | ParameterBase, start: int | None = None, end: int | None = None) → dict[str, xr.DataArray][source]

to_xarray_dataset(*params: str | ParamSpec | ParameterBase, start: int | None = None, end: int | None = None) → xr.Dataset[source]

to_pandas_dataframe_dict(*params: str | ParamSpec | ParameterBase, start: int | None = None, end: int | None = None) → dict[str, pd.DataFrame][source]

to_pandas_dataframe(*params: str | ParamSpec | ParameterBase, start: int | None = None, end: int | None = None) → pd.DataFrame[source]

the_same_dataset_as(other: DataSetProtocol) → bool[source]

class qcodes.dataset.DataSetType(value)[source]

Bases: str, Enum

An enumeration.

Attributes:

`DataSet`
`DataSetInMem`

DataSet = 'DataSet'

DataSetInMem = 'DataSetInMem'

class qcodes.dataset.InterDependencies_(dependencies: Dict[ParamSpecBase, Tuple[ParamSpecBase, ...]] | None = None, inferences: Dict[ParamSpecBase, Tuple[ParamSpecBase, ...]] | None = None, standalones: tuple[qcodes.dataset.descriptions.param_spec.ParamSpecBase, ...] = ())[source]

Bases: object

Object containing a group of ParamSpecs and the information about their internal relations to each other

Methods:

`validate_paramspectree`(paramspectree)	Validate a ParamSpecTree.
`what_depends_on`(ps)	Return a tuple of the parameters that depend on the given parameter.
`what_is_inferred_from`(ps)	Return a tuple of the parameters thatare inferred from the given parameter.
`extend`([dependencies, inferences, standalones])	Create a new `InterDependencies_` object that is an extension of this instance with the provided input
`remove`(parameter)	Create a new `InterDependencies_` object that is similar to this instance, but has the given parameter removed.
`validate_subset`(parameters)	Validate that the given parameters form a valid subset of the parameters of this instance, meaning that all the given parameters are actually found in this instance and that there are no missing dependencies/inferences.

Attributes:

`paramspecs`	Return the ParamSpecBase objects of this instance
`non_dependencies`	Return all parameters that are not dependencies of other parameters, i.e. return the top level parameters.
`names`	Return all the names of the parameters of this instance

static validate_paramspectree(paramspectree: Dict[ParamSpecBase, Tuple[ParamSpecBase, ...]]) → Tuple[Type[Exception], str] | None[source]

Validate a ParamSpecTree. Apart from adhering to the type, a ParamSpecTree must not have any cycles.

Returns:: A tuple with an exception type and an error message or None, if the paramtree is valid

what_depends_on(ps: ParamSpecBase) → tuple[qcodes.dataset.descriptions.param_spec.ParamSpecBase, ...][source]

Return a tuple of the parameters that depend on the given parameter. Returns an empty tuple if nothing depends on the given parameter

Parameters:: ps – the parameter to look up
Raises:: ValueError if the parameter is not part of this object –

what_is_inferred_from(ps: ParamSpecBase) → tuple[qcodes.dataset.descriptions.param_spec.ParamSpecBase, ...][source]

Return a tuple of the parameters thatare inferred from the given parameter. Returns an empty tuple if nothing is inferred from the given parameter

Parameters:: ps – the parameter to look up
Raises:: ValueError if the parameter is not part of this object –

property paramspecs: tuple[qcodes.dataset.descriptions.param_spec.ParamSpecBase, ...]: Return the ParamSpecBase objects of this instance

property non_dependencies: tuple[qcodes.dataset.descriptions.param_spec.ParamSpecBase, ...]: Return all parameters that are not dependencies of other parameters, i.e. return the top level parameters. Returned tuple is sorted by parameter names.

property names: tuple[str, ...]: Return all the names of the parameters of this instance

extend(dependencies: Dict[ParamSpecBase, Tuple[ParamSpecBase, ...]] | None = None, inferences: Dict[ParamSpecBase, Tuple[ParamSpecBase, ...]] | None = None, standalones: tuple[qcodes.dataset.descriptions.param_spec.ParamSpecBase, ...] = ()) → InterDependencies_[source]: Create a new InterDependencies_ object that is an extension of this instance with the provided input

remove(parameter: ParamSpecBase) → InterDependencies_[source]: Create a new InterDependencies_ object that is similar to this instance, but has the given parameter removed.

validate_subset(parameters: Sequence[ParamSpecBase]) → None[source]

Validate that the given parameters form a valid subset of the parameters of this instance, meaning that all the given parameters are actually found in this instance and that there are no missing dependencies/inferences.

Parameters:

parameters – The collection of ParamSpecBases to validate

Raises:

DependencyError, if a dependency is missing –
InferenceError, if an inference is missing –

class qcodes.dataset.LinSweep(param: ParameterBase, start: float, stop: float, num_points: int, delay: float = 0, post_actions: Sequence[Callable[[], None]] = (), get_after_set: bool = False)[source]

Bases: AbstractSweep[float64]

Linear sweep.

Parameters:

param – Qcodes parameter to sweep.
start – Sweep start value.
stop – Sweep end value.
num_points – Number of sweep points.
delay – Time in seconds between two consecutive sweep points.
post_actions – Actions to do after each sweep point.
get_after_set – Should we perform a get on the parameter after setting it and store the value returned by get rather than the set value in the dataset.

Methods:

get_setpoints()

Linear (evenly spaced) numpy array for supplied start, stop and num_points.

Attributes:

`param`	Returns the Qcodes sweep parameter.
`delay`	Delay between two consecutive sweep points.
`num_points`	Number of sweep points.
`post_actions`	actions to be performed after setting param to its setpoint.
`get_after_set`	Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

get_setpoints() → ndarray[Any, dtype[float64]][source]: Linear (evenly spaced) numpy array for supplied start, stop and num_points.

property param: ParameterBase: Returns the Qcodes sweep parameter.

property delay: float: Delay between two consecutive sweep points.

property num_points: int: Number of sweep points.

property post_actions: Sequence[Callable[[], None]]: actions to be performed after setting param to its setpoint.

property get_after_set: bool

Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

This defaults to False for backwards compatibility but subclasses should overwrite this to implement if correctly.

class qcodes.dataset.LogSweep(param: ParameterBase, start: float, stop: float, num_points: int, delay: float = 0, post_actions: Sequence[Callable[[], None]] = (), get_after_set: bool = False)[source]

Bases: AbstractSweep[float64]

Logarithmic sweep.

Parameters:

param – Qcodes parameter for sweep.
start – Sweep start value.
stop – Sweep end value.
num_points – Number of sweep points.
delay – Time in seconds between two consecutive sweep points.
post_actions – Actions to do after each sweep point.
get_after_set – Should we perform a get on the parameter after setting it and store the value returned by get rather than the set value in the dataset.

Methods:

get_setpoints()

Logarithmically spaced numpy array for supplied start, stop and num_points.

Attributes:

`param`	Returns the Qcodes sweep parameter.
`delay`	Delay between two consecutive sweep points.
`num_points`	Number of sweep points.
`post_actions`	actions to be performed after setting param to its setpoint.
`get_after_set`	Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

get_setpoints() → ndarray[Any, dtype[float64]][source]: Logarithmically spaced numpy array for supplied start, stop and num_points.

property param: ParameterBase: Returns the Qcodes sweep parameter.

property delay: float: Delay between two consecutive sweep points.

property num_points: int: Number of sweep points.

property post_actions: Sequence[Callable[[], None]]: actions to be performed after setting param to its setpoint.

property get_after_set: bool

Should we perform a call to get on the parameter after setting it and store that rather than the setpoint value in the dataset?

This defaults to False for backwards compatibility but subclasses should overwrite this to implement if correctly.

class qcodes.dataset.Measurement(exp: Experiment | None = None, station: Station | None = None, name: str = '')[source]

Bases: object

Measurement procedure container. Note that multiple measurement instances cannot be nested.

Parameters:

exp – Specify the experiment to use. If not given the default one is used. The default experiment is the latest one created.
station – The QCoDeS station to snapshot. If not given, the default one is used.
name – Name of the measurement. This will be passed down to the dataset produced by the measurement. If not given, a default value of ‘results’ is used for the dataset.

Attributes:

`parameters`
`write_period`

Methods:

`register_parent`(parent, link_type[, description])	Register a parent for the outcome of this measurement
`register_parameter`(parameter[, setpoints, ...])	Add QCoDeS Parameter to the dataset produced by running this measurement.
`register_custom_parameter`(name[, label, ...])	Register a custom parameter with this measurement
`unregister_parameter`(parameter)	Remove a custom/QCoDeS parameter from the dataset produced by running this measurement
`add_before_run`(func, args)	Add an action to be performed before the measurement.
`add_after_run`(func, args)	Add an action to be performed after the measurement.
`add_subscriber`(func, state)	Add a subscriber to the dataset of the measurement.
`set_shapes`(shapes)	Set the shapes of the data to be recorded in this measurement.
`run`([write_in_background, in_memory_cache, ...])	Returns the context manager for the experimental run

property parameters: dict[str, qcodes.dataset.descriptions.param_spec.ParamSpecBase]

property write_period: float

register_parent(parent: DataSetProtocol, link_type: str, description: str = '') → T[source]

Register a parent for the outcome of this measurement

Parameters:

parent – The parent dataset
link_type – A name for the type of parent-child link
description – A free-text description of the relationship

Add QCoDeS Parameter to the dataset produced by running this measurement.

Parameters:

parameter – The parameter to add
setpoints – The Parameter representing the setpoints for this parameter. If this parameter is a setpoint, it should be left blank
basis – The parameters that this parameter is inferred from. If this parameter is not inferred from any other parameters, this should be left blank.
paramtype – Type of the parameter, i.e. the SQL storage class, If None the paramtype will be inferred from the parameter type and the validator of the supplied parameter.

Register a custom parameter with this measurement

Parameters:

name – The name that this parameter will have in the dataset. Must be unique (will overwrite an existing parameter with the same name!)
label – The label
unit – The unit
basis – A list of either QCoDeS Parameters or the names of parameters already registered in the measurement that this parameter is inferred from
setpoints – A list of either QCoDeS Parameters or the names of of parameters already registered in the measurement that are the setpoints of this parameter
paramtype – Type of the parameter, i.e. the SQL storage class

unregister_parameter(parameter: Sequence[str | ParameterBase]) → None[source]: Remove a custom/QCoDeS parameter from the dataset produced by running this measurement

add_before_run(func: Callable[[...], Any], args: Sequence[Any]) → T[source]

Add an action to be performed before the measurement.

Parameters:

func – Function to be performed
args – The arguments to said function

add_after_run(func: Callable[[...], Any], args: Sequence[Any]) → T[source]

Add an action to be performed after the measurement.

Parameters:

func – Function to be performed
args – The arguments to said function

add_subscriber(func: Callable[[...], Any], state: MutableSequence[Any] | MutableMapping[Any, Any]) → T[source]

Add a subscriber to the dataset of the measurement.

Parameters:

func – A function taking three positional arguments: a list of tuples of parameter values, an integer, a mutable variable (list or dict) to hold state/writes updates to.
state – The variable to hold the state.

set_shapes(shapes: Dict[str, Tuple[int, ...]] | None) → None[source]

Set the shapes of the data to be recorded in this measurement.

Parameters:: shapes – Dictionary from names of dependent parameters to a tuple of integers describing the shape of the measurement.

run(write_in_background: bool | None = None, in_memory_cache: bool = True, dataset_class: DataSetType = DataSetType.DataSet) → Runner[source]

Returns the context manager for the experimental run

Parameters:

write_in_background – if True, results that will be added within the context manager with DataSaver.add_result will be stored in background, without blocking the main thread that is executing the context manager. By default the setting for write in background will be read from the qcodesrc.json config file.
in_memory_cache – Should measured data be keep in memory and available as part of the dataset.cache object.
dataset_class – Enum representing the Class used to store data with.

Bases: ParamSpecBase

Parameters:

name – name of the parameter
paramtype – type of the parameter, i.e. the SQL storage class
label – label of the parameter
inferred_from – the parameters that this parameter is inferred from
depends_on – the parameters that this parameter depends on

Attributes:

`inferred_from_`
`depends_on_`
`inferred_from`
`depends_on`
`allowed_types`

Methods:

`copy`()	Make a copy of self
`__hash__`()	Allow ParamSpecs in data structures that use hashing (i.e.
`base_version`()	Return a ParamSpecBase object with the same name, paramtype, label and unit as this ParamSpec
`sql_repr`()

property inferred_from_: list[str]

property depends_on_: list[str]

property inferred_from: str

property depends_on: str

copy() → ParamSpec[source]: Make a copy of self

__hash__() → int[source]: Allow ParamSpecs in data structures that use hashing (i.e. sets)

base_version() → ParamSpecBase[source]: Return a ParamSpecBase object with the same name, paramtype, label and unit as this ParamSpec

allowed_types = ['array', 'numeric', 'text', 'complex']

sql_repr() → str

class qcodes.dataset.RunDescriber(interdeps: InterDependencies_, shapes: Dict[str, Tuple[int, ...]] | None = None)[source]

Bases: object

The object that holds the description of each run in the database. This object serialises itself to a string and is found under the run_description column in the runs table.

Extension of this object is planned for the future, for now it holds the parameter interdependencies. Extensions should be objects that can convert themselves to dictionary and added as attributes to the RunDescriber, such that the RunDescriber can iteratively convert its attributes when converting itself to dictionary.

Attributes:

`version`
`shapes`
`interdeps`

property version: int

property shapes: Dict[str, Tuple[int, ...]] | None

property interdeps: InterDependencies_

class qcodes.dataset.SQLiteSettings[source]

Bases: object

Class that holds the machine’s sqlite options.

Note that the settings are not dynamically updated, so changes during runtime must be updated manually. But you probably should not be changing these settings dynamically in the first place.

Attributes:

`limits`
`settings`

limits = {'MAX_ATTACHED': 10, 'MAX_COLUMN': 2000, 'MAX_COMPOUND_SELECT': 500, 'MAX_EXPR_DEPTH': 1000, 'MAX_FUNCTION_ARG': 127, 'MAX_LENGTH': 1000000000, 'MAX_LIKE_PATTERN_LENGTH': 50000, 'MAX_PAGE_COUNT': 1073741823, 'MAX_SQL_LENGTH': 1000000000, 'MAX_VARIABLE_NUMBER': 250000}

settings = {'ATOMIC_INTRINSICS': 1, 'COMPILER': 'gcc-11.3.0', 'DEFAULT_AUTOVACUUM': True, 'DEFAULT_CACHE_SIZE': '-2000', 'DEFAULT_FILE_FORMAT': 4, 'DEFAULT_JOURNAL_SIZE_LIMIT': '-1', 'DEFAULT_MMAP_SIZE': True, 'DEFAULT_PAGE_SIZE': 4096, 'DEFAULT_PCACHE_INITSZ': 20, 'DEFAULT_RECURSIVE_TRIGGERS': True, 'DEFAULT_SECTOR_SIZE': 4096, 'DEFAULT_SYNCHRONOUS': 2, 'DEFAULT_WAL_AUTOCHECKPOINT': 1000, 'DEFAULT_WAL_SYNCHRONOUS': 2, 'DEFAULT_WORKER_THREADS': True, 'ENABLE_COLUMN_METADATA': True, 'ENABLE_DBSTAT_VTAB': True, 'ENABLE_FTS3': True, 'ENABLE_FTS3_PARENTHESIS': True, 'ENABLE_FTS3_TOKENIZER': True, 'ENABLE_FTS4': True, 'ENABLE_FTS5': True, 'ENABLE_JSON1': True, 'ENABLE_LOAD_EXTENSION': True, 'ENABLE_MATH_FUNCTIONS': True, 'ENABLE_PREUPDATE_HOOK': True, 'ENABLE_RTREE': True, 'ENABLE_SESSION': True, 'ENABLE_STMTVTAB': True, 'ENABLE_UNLOCK_NOTIFY': True, 'ENABLE_UPDATE_DELETE_LIMIT': True, 'HAVE_ISNAN': True, 'LIKE_DOESNT_MATCH_BLOBS': True, 'MALLOC_SOFT_LIMIT': 1024, 'MAX_DEFAULT_PAGE_SIZE': 32768, 'MAX_MMAP_SIZE': '0x7fff0000', 'MAX_PAGE_SIZE': 65536, 'MAX_SCHEMA_RETRY': 25, 'MAX_TRIGGER_DEPTH': 1000, 'MAX_VDBE_OP': 250000000, 'MAX_WORKER_THREADS': 8, 'MUTEX_PTHREADS': True, 'OMIT_LOOKASIDE': True, 'SECURE_DELETE': True, 'SOUNDEX': True, 'SYSTEM_MALLOC': True, 'TEMP_STORE': 1, 'THREADSAFE': 1, 'USE_URI': True, 'VERSION': '3.37.2'}

class qcodes.dataset.SequentialParamsCaller(*param_meas: ParamMeasT)[source]: Bases: _ParamsCallerProtocol

class qcodes.dataset.ThreadPoolParamsCaller(*param_meas: ParamMeasT, max_workers: int | None = None)[source]

Bases: _ParamsCallerProtocol

Context manager for calling given parameters in a thread pool. Note that parameters that have the same underlying instrument will be called in the same thread.

Usage:

...
with ThreadPoolParamsCaller(p1, p2, ...) as pool_caller:
    ...
    output = pool_caller()
    ...
    # Output can be passed directly into DataSaver.add_result:
    # datasaver.add_result(*output)
    ...
...

Parameters:

param_meas – parameter or a callable without arguments
max_workers – number of worker threads to create in the pool; if None, the number of worker threads will be equal to the number of unique “underlying instruments”

Methods:

__call__()

Call parameters in the thread pool and return (param, value) tuples.

__call__() → OutType[source]: Call parameters in the thread pool and return (param, value) tuples.

class qcodes.dataset.TogetherSweep(*sweeps: AbstractSweep)[source]

Bases: object

A combination of Multiple sweeps that are to be performed in parallel such that all parameters in the TogetherSweep are set to the next value before a parameter is read.

Attributes:

`sweeps`
`num_points`

Methods:

get_setpoints()

property sweeps: tuple[qcodes.dataset.dond.sweeps.AbstractSweep, ...]

get_setpoints() → Iterable[source]

property num_points: int

qcodes.dataset.call_params_threaded(param_meas: Sequence[ParamMeasT]) → OutType[source]

Function to create threads per instrument for the given set of measurement parameters.

Parameters:: param_meas – a Sequence of measurement parameters

qcodes.dataset.connect(name: str | Path, debug: bool = False, version: int = -1) → ConnectionPlus[source]

Connect or create database. If debug the queries will be echoed back. This function takes care of registering the numpy/sqlite type converters that we need.

Parameters:

name – name or path to the sqlite file
debug – should tracing be turned on.
version – which version to create. We count from 0. -1 means ‘latest’. Should always be left at -1 except when testing.

Returns:

connection object to the database (note, it is ConnectionPlus, not sqlite3.Connection)

qcodes.dataset.do0d(*param_meas: ParamMeasT, write_period: float | None = None, measurement_name: str = '', exp: Experiment | None = None, do_plot: bool | None = None, use_threads: bool | None = None, log_info: str | None = None) → AxesTupleListWithDataSet[source]

Perform a measurement of a single parameter. This is probably most useful for an ArrayParameter that already returns an array of data points

Parameters:

*param_meas – Parameter(s) to measure at each step or functions that will be called at each step. The function should take no arguments. The parameters and functions are called in the order they are supplied.
write_period – The time after which the data is actually written to the database.
measurement_name – Name of the measurement. This will be passed down to the dataset produced by the measurement. If not given, a default value of ‘results’ is used for the dataset.
exp – The experiment to use for this measurement.
do_plot – should png and pdf versions of the images be saved after the run. If None the setting will be read from qcodesrc.json
use_threads – If True measurements from each instrument will be done on separate threads. If you are measuring from several instruments this may give a significant speedup.
log_info – Message that is logged during the measurement. If None a default message is used.

Returns:

The QCoDeS dataset.

qcodes.dataset.do1d(param_set: ParameterBase, start: float, stop: float, num_points: int, delay: float, *param_meas: ParamMeasT, enter_actions: ActionsT = (), exit_actions: ActionsT = (), write_period: float | None = None, measurement_name: str = '', exp: Experiment | None = None, do_plot: bool | None = None, use_threads: bool | None = None, additional_setpoints: Sequence[ParameterBase] = (), show_progress: bool | None = None, log_info: str | None = None, break_condition: BreakConditionT | None = None) → AxesTupleListWithDataSet[source]

Perform a 1D scan of param_set from start to stop in num_points measuring param_meas at each step. In case param_meas is an ArrayParameter this is effectively a 2d scan.

Parameters:

param_set – The QCoDeS parameter to sweep over
start – Starting point of sweep
stop – End point of sweep
num_points – Number of points in sweep
delay – Delay after setting parameter before measurement is performed
param_meas – Parameter(s) to measure at each step or functions that will be called at each step. The function should take no arguments. The parameters and functions are called in the order they are supplied.
enter_actions – A list of functions taking no arguments that will be called before the measurements start
exit_actions – A list of functions taking no arguments that will be called after the measurements ends
write_period – The time after which the data is actually written to the database.
additional_setpoints – A list of setpoint parameters to be registered in the measurement but not scanned.
measurement_name – Name of the measurement. This will be passed down to the dataset produced by the measurement. If not given, a default value of ‘results’ is used for the dataset.
exp – The experiment to use for this measurement.
do_plot – should png and pdf versions of the images be saved after the run. If None the setting will be read from qcodesrc.json
use_threads – If True measurements from each instrument will be done on separate threads. If you are measuring from several instruments this may give a significant speedup.
show_progress – should a progress bar be displayed during the measurement. If None the setting will be read from qcodesrc.json
log_info – Message that is logged during the measurement. If None a default message is used.
break_condition – Callable that takes no arguments. If returned True, measurement is interrupted.

Returns:

The QCoDeS dataset.

qcodes.dataset.do2d(param_set1: ParameterBase, start1: float, stop1: float, num_points1: int, delay1: float, param_set2: ParameterBase, start2: float, stop2: float, num_points2: int, delay2: float, *param_meas: ParamMeasT, set_before_sweep: bool | None = True, enter_actions: ActionsT = (), exit_actions: ActionsT = (), before_inner_actions: ActionsT = (), after_inner_actions: ActionsT = (), write_period: float | None = None, measurement_name: str = '', exp: Experiment | None = None, flush_columns: bool = False, do_plot: bool | None = None, use_threads: bool | None = None, additional_setpoints: Sequence[ParameterBase] = (), show_progress: bool | None = None, log_info: str | None = None, break_condition: BreakConditionT | None = None) → AxesTupleListWithDataSet[source]

Perform a 1D scan of param_set1 from start1 to stop1 in num_points1 and param_set2 from start2 to stop2 in num_points2 measuring param_meas at each step.

Parameters:

param_set1 – The QCoDeS parameter to sweep over in the outer loop
start1 – Starting point of sweep in outer loop
stop1 – End point of sweep in the outer loop
num_points1 – Number of points to measure in the outer loop
delay1 – Delay after setting parameter in the outer loop
param_set2 – The QCoDeS parameter to sweep over in the inner loop
start2 – Starting point of sweep in inner loop
stop2 – End point of sweep in the inner loop
num_points2 – Number of points to measure in the inner loop
delay2 – Delay after setting parameter before measurement is performed
param_meas – Parameter(s) to measure at each step or functions that will be called at each step. The function should take no arguments. The parameters and functions are called in the order they are supplied.
set_before_sweep – if True the outer parameter is set to its first value before the inner parameter is swept to its next value.
enter_actions – A list of functions taking no arguments that will be called before the measurements start
exit_actions – A list of functions taking no arguments that will be called after the measurements ends
before_inner_actions – Actions executed before each run of the inner loop
after_inner_actions – Actions executed after each run of the inner loop
write_period – The time after which the data is actually written to the database.
measurement_name – Name of the measurement. This will be passed down to the dataset produced by the measurement. If not given, a default value of ‘results’ is used for the dataset.
exp – The experiment to use for this measurement.
flush_columns – The data is written after a column is finished independent of the passed time and write period.
additional_setpoints – A list of setpoint parameters to be registered in the measurement but not scanned.
do_plot – should png and pdf versions of the images be saved after the run. If None the setting will be read from qcodesrc.json
use_threads – If True measurements from each instrument will be done on separate threads. If you are measuring from several instruments this may give a significant speedup.
show_progress – should a progress bar be displayed during the measurement. If None the setting will be read from qcodesrc.json
log_info – Message that is logged during the measurement. If None a default message is used.
break_condition – Callable that takes no arguments. If returned True, measurement is interrupted.

Returns:

The QCoDeS dataset.

qcodes.dataset.dond(*params: AbstractSweep | TogetherSweep | ParamMeasT | Sequence[ParamMeasT], write_period: float | None = None, measurement_name: str | Sequence[str] = '', exp: Experiment | Sequence[Experiment] | None = None, enter_actions: ActionsT = (), exit_actions: ActionsT = (), do_plot: bool | None = None, show_progress: bool | None = None, use_threads: bool | None = None, additional_setpoints: Sequence[ParameterBase] = (), log_info: str | None = None, break_condition: BreakConditionT | None = None, dataset_dependencies: Mapping[str, Sequence[ParamMeasT]] | None = None) → AxesTupleListWithDataSet | MultiAxesTupleListWithDataSet[source]

Perform n-dimentional scan from slowest (first) to the fastest (last), to measure m measurement parameters. The dimensions should be specified as sweep objects, and after them the parameters to measure should be passed.

Parameters:

params –

Instances of n sweep classes and m measurement parameters, e.g. if linear sweep is considered:

LinSweep(param_set_1, start_1, stop_1, num_points_1, delay_1), ...,
LinSweep(param_set_n, start_n, stop_n, num_points_n, delay_n),
param_meas_1, param_meas_2, ..., param_meas_m

If multiple DataSets creation is needed, measurement parameters should be grouped, so one dataset will be created for each group. e.g.:

LinSweep(param_set_1, start_1, stop_1, num_points_1, delay_1), ...,
LinSweep(param_set_n, start_n, stop_n, num_points_n, delay_n),
[param_meas_1, param_meas_2], ..., [param_meas_m]

If you want to sweep multiple parameters together.

TogetherSweep(LinSweep(param_set_1, start_1, stop_1, num_points, delay_1),
              LinSweep(param_set_2, start_2, stop_2, num_points, delay_2))
param_meas_1, param_meas_2, ..., param_meas_m

write_period – The time after which the data is actually written to the database.
measurement_name – Name(s) of the measurement. This will be passed down to the dataset produced by the measurement. If not given, a default value of ‘results’ is used for the dataset. If more than one is given, each dataset will have an individual name.
exp – The experiment to use for this measurement. If you create multiple measurements using groups you may also supply multiple experiments.
enter_actions – A list of functions taking no arguments that will be called before the measurements start.
exit_actions – A list of functions taking no arguments that will be called after the measurements ends.
do_plot – should png and pdf versions of the images be saved and plots are shown after the run. If None the setting will be read from qcodesrc.json
show_progress – should a progress bar be displayed during the measurement. If None the setting will be read from qcodesrc.json
use_threads – If True, measurements from each instrument will be done on separate threads. If you are measuring from several instruments this may give a significant speedup.
additional_setpoints – A list of setpoint parameters to be registered in the measurement but not scanned/swept-over.
log_info – Message that is logged during the measurement. If None a default message is used.
break_condition – Callable that takes no arguments. If returned True, measurement is interrupted.
dataset_dependencies – Optionally describe that measured datasets only depend on a subset of the setpoint parameters. Given as a mapping from measurement names to Sequence of Parameters. Note that a dataset must depend on at least one parameter from each dimension but can depend on one or more parameters from a dimension sweeped with a TogetherSweep.

Returns:

A tuple of QCoDeS DataSet, Matplotlib axis, Matplotlib colorbar. If more than one group of measurement parameters is supplied, the output will be a tuple of tuple(QCoDeS DataSet), tuple(Matplotlib axis), tuple(Matplotlib colorbar), in which each element of each sub-tuple belongs to one group, and the order of elements is the order of the supplied groups.

qcodes.dataset.experiments(conn: ConnectionPlus | None = None) → list[qcodes.dataset.experiment_container.Experiment][source]

List all the experiments in the container (database file from config)

Parameters:: conn – connection to the database. If not supplied, a new connection to the DB file specified in the config is made
Returns:: All the experiments in the container

qcodes.dataset.extract_runs_into_db(source_db_path: str | Path, target_db_path: str | Path, *run_ids: int, upgrade_source_db: bool = False, upgrade_target_db: bool = False) → None[source]

Extract a selection of runs into another DB file. All runs must come from the same experiment. They will be added to an experiment with the same name and sample_name in the target db. If such an experiment does not exist, it will be created.

Parameters:

source_db_path – Path to the source DB file
target_db_path – Path to the target DB file. The target DB file will be created if it does not exist.
run_ids – The run_id’s of the runs to copy into the target DB file
upgrade_source_db – If the source DB is found to be in a version that is not the newest, should it be upgraded?
upgrade_target_db – If the target DB is found to be in a version that is not the newest, should it be upgraded?

qcodes.dataset.get_data_export_path() → Path[source]

Get the path to export data to at the end of a measurement from config

Returns:: Path

qcodes.dataset.get_default_experiment_id(conn: ConnectionPlus) → int[source]

Returns the latest created/ loaded experiment’s exp_id as the default experiment. If it is not set the maximum exp_id returned as the default. If no experiment is found in the database, a ValueError is raised.

Parameters:: conn – Open connection to the db in question.
Returns:: exp_id of the default experiment.
Raises:: ValueError – If no experiment exists in the given db.

Get a list of matching guids from one or more pieces of runs specification. All fields are optional.

Parameters:

captured_run_id – The run_id that was originally assigned to this at the time of capture.
captured_counter – The counter that was originally assigned to this at the time of capture.
experiment_name – name of the experiment that the run was captured
sample_name – The name of the sample given when creating the experiment.
sample_id – The sample_id assigned as part of the GUID.
location – The location code assigned as part of GUID.
work_station – The workstation assigned as part of the GUID.
conn – An optional connection to the database. If no connection is supplied a connection to the default database will be opened.

Returns:

List of guids matching the run spec.

qcodes.dataset.guids_from_dbs(db_paths: Iterable[Path]) → tuple[dict[pathlib.Path, list[str]], dict[str, pathlib.Path]][source]

Extract all guids from the supplied database paths.

Parameters:: db_paths – Path or str or directory where to search
Returns:: Tuple of Dictionary mapping paths to lists of guids as strings and Dictionary mapping guids to db paths.

qcodes.dataset.guids_from_dir(basepath: Path | str) → tuple[dict[pathlib.Path, list[str]], dict[str, pathlib.Path]][source]

Recursively find all db files under basepath and extract guids.

Parameters:: basepath – Path or str or directory where to search
Returns:: Tuple of Dictionary mapping paths to lists of guids as strings and Dictionary mapping guids to db paths.

qcodes.dataset.guids_from_list_str(s: str) → tuple[str, ...] | None[source]

Get tuple of guids from a python/json string representation of a list.

Extracts the guids from a string representation of a list, tuple, or set of guids or a single guid.

Parameters:: s – input string
Returns:: Extracted guids as a tuple of strings. If a provided string does not match the format, None will be returned. For an empty list/tuple/set or empty string an empty tuple is returned.

Examples

>>> guids_from_str(
"['07fd7195-c51e-44d6-a085-fa8274cf00d6',           '070d7195-c51e-44d6-a085-fa8274cf00d6']")
will return
('07fd7195-c51e-44d6-a085-fa8274cf00d6',
'070d7195-c51e-44d6-a085-fa8274cf00d6')

qcodes.dataset.import_dat_file(location: str | Path, exp: Experiment | None = None) → list[int][source]

This imports a QCoDeS legacy qcodes.data.data_set.DataSet into the database.

Parameters:

location – Path to file containing legacy dataset
exp – Specify the experiment to store data to. If None the default one is used. See the docs of qcodes.dataset.Measurement for more details.

qcodes.dataset.initialise_database(journal_mode: Literal['DELETE', 'TRUNCATE', 'PERSIST', 'MEMORY', 'WAL', 'OFF'] | None = 'WAL') → None[source]

Initialise a database in the location specified by the config object and set atomic commit and rollback mode of the db. The db is created with the latest supported version. If the database already exists the atomic commit and rollback mode is set and the database is upgraded to the latest version.

Parameters:: journal_mode – Which journal_mode should be used for atomic commit and rollback. Options are DELETE, TRUNCATE, PERSIST, MEMORY, WAL and OFF. If set to None no changes are made.

qcodes.dataset.initialise_or_create_database_at(db_file_with_abs_path: str | Path, journal_mode: Literal['DELETE', 'TRUNCATE', 'PERSIST', 'MEMORY', 'WAL', 'OFF'] | None = 'WAL') → None[source]

This function sets up QCoDeS to refer to the given database file. If the database file does not exist, it will be initiated.

Parameters:

db_file_with_abs_path – Database file name with absolute path, for example C:\mydata\majorana_experiments.db
journal_mode – Which journal_mode should be used for atomic commit and rollback. Options are DELETE, TRUNCATE, PERSIST, MEMORY, WAL and OFF. If set to None no changes are made.

qcodes.dataset.initialised_database_at(db_file_with_abs_path: str | Path) → Iterator[None][source]

Initializes or creates a database and restores the ‘db_location’ afterwards.

Parameters:: db_file_with_abs_path – Database file name with absolute path, for example C:\mydata\majorana_experiments.db

qcodes.dataset.load_by_counter(counter: int, exp_id: int, conn: ConnectionPlus | None = None) → DataSetProtocol[source]

Load a dataset given its counter in a given experiment

Lookup is performed in the database file that is specified in the config.

Note that the counter used in this function in not preserved when copying data to another db file. We recommend using load_by_run_spec() which does not have this issue and is significantly more flexible.

If the raw data is in the database this will be loaded as a qcodes.dataset.data_set.DataSet otherwise it will be loaded as a DataSetInMemory

Parameters:

counter – counter of the dataset within the given experiment
exp_id – id of the experiment where to look for the dataset
conn – connection to the database to load from. If not provided, a connection to the DB file specified in the config is made

Returns:

qcodes.dataset.data_set.DataSet or DataSetInMemory of the given counter in the given experiment

qcodes.dataset.load_by_guid(guid: str, conn: ConnectionPlus | None = None) → DataSetProtocol[source]

Load a dataset by its GUID

If no connection is provided, lookup is performed in the database file that is specified in the config.

If the raw data is in the database this will be loaded as a qcodes.dataset.data_set.DataSet otherwise it will be loaded as a DataSetInMemory

Parameters:

guid – guid of the dataset
conn – connection to the database to load from

Returns:

qcodes.dataset.data_set.DataSet or DataSetInMemory with the given guid

Raises:

NameError – if no run with the given GUID exists in the database
RuntimeError – if several runs with the given GUID are found

qcodes.dataset.load_by_id(run_id: int, conn: ConnectionPlus | None = None) → DataSetProtocol[source]

Load a dataset by run id

If no connection is provided, lookup is performed in the database file that is specified in the config.

Note that the run_id used in this function in not preserved when copying data to another db file. We recommend using load_by_run_spec() which does not have this issue and is significantly more flexible.

If the raw data is in the database this will be loaded as a qcodes.dataset.data_set.DataSet otherwise it will be loaded as a DataSetInMemory

Parameters:

run_id – run id of the dataset
conn – connection to the database to load from

Returns:

qcodes.dataset.data_set.DataSet or DataSetInMemory with the given run id

Load a run from one or more pieces of runs specification. All fields are optional but the function will raise an error if more than one run matching the supplied specification is found. Along with the error specs of the runs found will be printed.

If the raw data is in the database this will be loaded as a qcodes.dataset.data_set.DataSet otherwise it will be loaded as a DataSetInMemory

Parameters:

captured_run_id – The run_id that was originally assigned to this at the time of capture.
captured_counter – The counter that was originally assigned to this at the time of capture.
experiment_name – name of the experiment that the run was captured
sample_name – The name of the sample given when creating the experiment.
sample_id – The sample_id assigned as part of the GUID.
location – The location code assigned as part of GUID.
work_station – The workstation assigned as part of the GUID.
conn – An optional connection to the database. If no connection is supplied a connection to the default database will be opened.

Raises:

NameError – if no run or more than one run with the given specification exists in the database

Returns:

qcodes.dataset.data_set.DataSet or DataSetInMemory matching the provided specification.

qcodes.dataset.load_experiment(exp_id: int, conn: ConnectionPlus | None = None) → Experiment[source]

Load experiment with the specified id (from database file from config)

Parameters:

exp_id – experiment id
conn – connection to the database. If not supplied, a new connection to the DB file specified in the config is made

Returns:

experiment with the specified id

Raises:

ValueError – If experiment id is not an integer.

qcodes.dataset.load_experiment_by_name(name: str, sample: str | None = None, conn: ConnectionPlus | None = None, load_last_duplicate: bool = False) → Experiment[source]

Try to load experiment with the specified name.

Nothing stops you from having many experiments with the same name and sample name. In that case this won’t work unless load_last_duplicate is set to True. Then, the last of duplicated experiments will be loaded.

Parameters:

name – the name of the experiment
sample – the name of the sample
load_last_duplicate – If True, prevent raising error for having multiple experiments with the same name and sample name, and load the last duplicated experiment, instead.
conn – connection to the database. If not supplied, a new connection to the DB file specified in the config is made

Returns:

The requested experiment

Raises:

ValueError – either if the name and sample name are not unique, unless load_last_duplicate is True, or if no experiment found for the supplied name and sample.

qcodes.dataset.load_from_netcdf(path: Path | str, path_to_db: Path | str | None = None) → DataSetInMem[source]

Create a in memory dataset from a netcdf file. The netcdf file is expected to contain a QCoDeS dataset that has been exported using the QCoDeS netcdf export functions.

Parameters:

path – Path to the netcdf file to import.
path_to_db – Optional path to a database where this dataset may be exported to. If not supplied the path can be given at export time or the dataset exported to the default db as set in the QCoDeS config.

Returns:

The loaded dataset.

qcodes.dataset.load_last_experiment() → Experiment[source]

Load last experiment (from database file from config)

Returns:: The last experiment
Raises:: ValueError – If no experiment exists in the db.

qcodes.dataset.load_or_create_experiment(experiment_name: str, sample_name: str | None = None, conn: ConnectionPlus | None = None, load_last_duplicate: bool = False) → Experiment[source]

Find and return an experiment with the given name and sample name, or create one if not found.

Parameters:

experiment_name – Name of the experiment to find or create.
sample_name – Name of the sample.
load_last_duplicate – If True, prevent raising error for having multiple experiments with the same name and sample name, and load the last duplicated experiment, instead.
conn – Connection to the database. If not supplied, a new connection to the DB file specified in the config is made.

Returns:

The found or created experiment

Raises:

ValueError – If the name and sample name are not unique, unless load_last_duplicate is True.

Create a new dataset in the currently active/selected database.

If exp_id is not specified, the last experiment will be loaded by default.

Parameters:

name – the name of the new dataset
exp_id – the id of the experiments this dataset belongs to, defaults to the last experiment
specs – list of parameters to create this dataset with
values – the values to associate with the parameters
metadata – the metadata to associate with the dataset
in_memory_cache – Should measured data be keep in memory and available as part of the dataset.cache object.

Returns:

the newly created qcodes.dataset.data_set.DataSet

qcodes.dataset.new_experiment(name: str, sample_name: str | None, format_string: str = '{}-{}-{}', conn: ConnectionPlus | None = None) → Experiment[source]

Create a new experiment (in the database file from config)

Parameters:

name – the name of the experiment
sample_name – the name of the current sample
format_string – basic format string for table-name must contain 3 placeholders.
conn – connection to the database. If not supplied, a new connection to the DB file specified in the config is made

Returns:

the new experiment

qcodes.dataset.plot_by_id(run_id: int, axes: Axes | Sequence[Axes] | None = None, colorbars: Colorbar | Sequence[Colorbar] | None = None, rescale_axes: bool = True, auto_color_scale: bool | None = None, cutoff_percentile: tuple[float, float] | float | None = None, complex_plot_type: Literal['real_and_imag', 'mag_and_phase'] = 'real_and_imag', complex_plot_phase: Literal['radians', 'degrees'] = 'radians', **kwargs: Any) → AxesTupleList[source]: Construct all plots for a given run_id. Here run_id is an alias for captured_run_id for historical reasons. See the docs of qcodes.dataset.load_by_run_spec() for details of loading runs. All other arguments are forwarded to plot_dataset(), see this for more details.

qcodes.dataset.plot_dataset(dataset: DataSetProtocol, axes: Axes | Sequence[Axes] | None = None, colorbars: Colorbar | Sequence[Colorbar] | Sequence[None] | None = None, rescale_axes: bool = True, auto_color_scale: bool | None = None, cutoff_percentile: tuple[float, float] | float | None = None, complex_plot_type: Literal['real_and_imag', 'mag_and_phase'] = 'real_and_imag', complex_plot_phase: Literal['radians', 'degrees'] = 'radians', **kwargs: Any) → AxesTupleList[source]

Construct all plots for a given dataset

Implemented so far:

1D line and scatter plots

2D plots on filled out rectangular grids

2D scatterplots (fallback)

The function can optionally be supplied with a matplotlib axes or a list of axes that will be used for plotting. The user should ensure that the number of axes matches the number of datasets to plot. To plot several (1D) dataset in the same axes supply it several times. Colorbar axes are created dynamically. If colorbar axes are supplied, they will be reused, yet new colorbar axes will be returned.

The plot has a title that comprises run id, experiment name, and sample name.

**kwargs are passed to matplotlib’s relevant plotting functions By default the data in any vector plot will be rasterized for scatter plots and heatmaps if more than 5000 points are supplied. This can be overridden by supplying the rasterized kwarg.

Parameters:

dataset – The dataset to plot
axes – Optional Matplotlib axes to plot on. If not provided, new axes will be created
colorbars – Optional Matplotlib Colorbars to use for 2D plots. If not provided, new ones will be created
rescale_axes – If True, tick labels and units for axes of parameters with standard SI units will be rescaled so that, for example, ‘0.00000005’ tick label on ‘V’ axis are transformed to ‘50’ on ‘nV’ axis (‘n’ is ‘nano’)
auto_color_scale – If True, the colorscale of heatmap plots will be automatically adjusted to disregard outliers.
cutoff_percentile – Percentile of data that may maximally be clipped on both sides of the distribution. If given a tuple (a,b) the percentile limits will be a and 100-b. See also the plotting tuorial notebook.
complex_plot_type – Method for converting complex-valued parameters into two real-valued parameters, either "real_and_imag" or "mag_and_phase". Applicable only for the cases where the dataset contains complex numbers
complex_plot_phase – Format of phase for plotting complex-valued data, either "radians" or "degrees". Applicable only for the cases where the dataset contains complex numbers

Returns:

A list of axes and a list of colorbars of the same length. The colorbar axes may be None if no colorbar is created (e.g. for 1D plots)

Config dependencies: (qcodesrc.json)

qcodes.dataset.reset_default_experiment_id(conn: ConnectionPlus | None = None) → None[source]: Resets the default experiment id to to the last experiment in the db.

qcodes.dataset.rundescriber_from_json(json_str: str) → RunDescriber: Deserialize a JSON string into a RunDescriber of the current version