lsst.daf.butler

Using the Butler

This module provides an abstracted data access interface, known as the Butler. It can be used to read and write data without having to know the details of file formats or locations.

Concrete Storage Classes

Design and Development

lsst.daf.butler is developed at https://github.com/lsst/daf_butler. You can find Jira issues for this module under the daf_butler component.

Python API reference

lsst.daf.butler Package

Functions

addDimensionForeignKey(tableSpec, dimension, …) Add a field and possibly a foreign key to a table specification.

Classes

AbstractDatastoreCacheManager(config, …) An abstract base class for managing caching in a Datastore.
AmbiguousDatasetError Raised when a DatasetRef is not resolved but should be.
Butler(config, str, None] = None, *, butler, …) Main entry point for the data access system.
ButlerConfig(other, …) Contains the configuration for a Butler
ButlerURI Convenience wrapper around URI parsers.
ButlerValidationError There is a problem with the Butler configuration.
CollectionSearch An ordered search path of collections.
CollectionType Enumeration used to label different types of collections.
CompositesConfig([other, validate, …]) Configuration specifics for Composites.
CompositesMap(config, ButlerConfig, …) Determine whether something should be disassembled.
Config([other]) Implements a datatype that is used by Butler for configuration.
ConfigSubset([other, validate, …]) Config representing a subset of a more general configuration.
Constraints(config, str]], *, universe) Determine whether an entity is allowed to be handled.
ConstraintsConfig([other]) Configuration information for Constraints.
ConstraintsValidationError Thrown when a constraints list has mutually exclusive definitions.
DataCoordinate Data ID dictionary.
DataCoordinateIterable An abstract base class for homogeneous iterables of data IDs.
DataCoordinateSequence(dataIds, graph, *, …) Iterable supporting the full Sequence interface.
DataCoordinateSet(dataIds, graph, *, …) Iterable iteration that is set-like.
DatabaseDimension(name, storage, *, …) A Dimension class that maps directly to a database table or query.
DatabaseDimensionCombination(name, storage, …) A combination class that maps directly to a database table or query.
DatabaseDimensionElement(name, storage, *, …) An intermediate base class for DimensionElement database classes.
DatabaseTopologicalFamily(name, space, *, …) Database topological family implementation.
DatasetAssociation(ref, collection, timespan) Class representing the membership of a dataset in a single collection.
DatasetComponent(name, storageClass, component) Component of a dataset and associated information.
DatasetIdGenEnum This enum is used to specify dataset ID generation options for insert() method.
DatasetRef(datasetType, dataId, *, id, …) Reference to a Dataset in a Registry.
DatasetType(name, dimensions, …) A named category of Datasets.
DatasetTypeNotSupportedError A DatasetType is not handled by this routine.
Datastore(config, str], bridgeManager, …) Datastore interface.
DatastoreCacheManager(config, …) A class for managing caching in a Datastore using local files.
DatastoreCacheManagerConfig([other, …]) Configuration information for DatastoreCacheManager.
DatastoreConfig([other, validate, …]) Configuration for Datastores.
DatastoreDisabledCacheManager(config, …) A variant of the datastore cache where no cache is enabled.
DatastoreValidationError There is a problem with the Datastore configuration.
DeferredDatasetHandle(butler, ref, parameters) Proxy class that provides deferred loading of a dataset from a butler.
Dimension A dimension.
DimensionCombination Element with extra information.
DimensionConfig(other, …) Configuration that defines a DimensionUniverse.
DimensionElement A label and/or metadata in the dimensions system.
DimensionGraph An immutable, dependency-complete collection of dimensions.
DimensionPacker(fixed, dimensions) Class for going from DataCoordinate to packed integer ID and back.
DimensionRecord(**kwargs) Base class for the Python representation of database records.
DimensionUniverse Self-consistent set of dimensions.
FileDataset(path, refs, …) A struct that represents a dataset exported to a file.
FileDescriptor(location, storageClass, …) Describes a particular file.
FileTemplate(template) Format a path template into a fully expanded path.
FileTemplateValidationError Exception for file template inconsistent with associated DatasetType.
FileTemplates(config, str], default, *, universe) Collection of FileTemplate templates.
FileTemplatesConfig([other]) Configuration information for FileTemplates.
Formatter(fileDescriptor, dataId, …) Interface for reading and writing Datasets.
FormatterFactory() Factory for Formatter instances.
GovernorDimension(name, storage, *, …) Governor dimension.
Location(datastoreRootUri, …) Identifies a location within the Datastore.
LocationFactory(datastoreRoot, str]) Factory for Location instances.
LookupKey(name, dimensions, …) Representation of key that can be used to lookup information.
MappingFactory(refType) Register the mapping of some key to a python type and retrieve instances.
NameMappingSetView(mapping, K_co]) A lightweight implementation of NamedValueAbstractSet.
NamedKeyDict(*args) Dictionary wrapper for named keys.
NamedKeyMapping Custom mapping class.
NamedValueAbstractSet Custom sets with named elements.
NamedValueMutableSet Mutable variant of NamedValueAbstractSet.
NamedValueSet(elements) Custom mutable set class.
Progress(name, level) Public interface for reporting incremental progress in the butler and related tools.
PruneCollectionsArgsError Base class for errors relating to Butler.pruneCollections input arguments.
PurgeUnsupportedPruneCollectionsError(…) Raised when purge is True but is not supported for the given collection.
PurgeWithoutUnstorePruneCollectionsError() Raised when purge and unstore are both required to be True, and purge is True but unstore is False.
Quantum(*, taskName, taskClass, dataId, …) Class representing a discrete unit of work.
Registry Abstract Registry interface.
RegistryConfig([other, validate, …])
RunWithoutPurgePruneCollectionsError(…) Raised when pruning a RUN collection but purge is False.
SerializedDataCoordinate Simplified model for serializing a DataCoordinate.
SerializedDatasetRef Simplified model of a DatasetRef suitable for serialization.
SerializedDatasetType Simplified model of a DatasetType suitable for serialization.
SerializedDimensionGraph Simplified model of a DimensionGraph suitable for serialization.
SerializedDimensionRecord Simplified model for serializing a DimensionRecord.
SimpleQuery() A struct that combines SQLAlchemy objects.
SkyPixDimension(system, level) Special dimension for sky pixelizations.
SkyPixSystem(name, *, maxLevel, …) Class for hierarchical pixelization of the sky.
SpatialRegionDatabaseRepresentation(column, name) Class reflecting how spatial regions are represented inside the DB.
StorageClass(name, pytype, str, …) Class describing how a label maps to a particular Python type.
StorageClassConfig([other, validate, …]) Configuration class for defining Storage Classes.
StorageClassDelegate(storageClass) Delegate class for StorageClass components and parameters.
StorageClassFactory(config, str, None] = None) Factory for StorageClass instances.
StoredDatastoreItemInfo Internal information associated with a stored dataset in a Datastore.
StoredFileInfo(formatter, …) Datastore-private metadata associated with a Datastore file.
Timespan(begin, …) A half-open time interval with nanosecond precision.
TimespanDatabaseRepresentation Representation of a time span within a database engine.
TopologicalExtentDatabaseRepresentation Mapping of in-memory representation of a region to DB representation.
TopologicalFamily(name, space) A grouping of TopologicalRelationshipEndpoint objects.
TopologicalRelationshipEndpoint Representation of a logical table that can participate in overlap joins.
TopologicalSpace Enumeration of continuous-variable relationships for dimensions.
ValidationError Some sort of validation error has occurred.
YamlRepoExportBackend(stream) A repository export implementation that saves to a YAML file.
YamlRepoImportBackend(stream, registry) A repository import implementation that reads from a YAML file.

Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.core.datastoreCacheManager.AbstractDatastoreCacheManager, lsst.daf.butler.core.datasets.ref.AmbiguousDatasetError, lsst.daf.butler._butler.Butler, lsst.daf.butler._butlerConfig.ButlerConfig, lsst.daf.butler.core._butlerUri._butlerUri.ButlerURI, lsst.daf.butler._butler.ButlerValidationError, lsst.daf.butler.registry.wildcards.CollectionSearch, lsst.daf.butler.registry._collectionType.CollectionType, lsst.daf.butler.core.composites.CompositesConfig, lsst.daf.butler.core.composites.CompositesMap, lsst.daf.butler.core.config.Config, lsst.daf.butler.core.config.ConfigSubset, lsst.daf.butler.core.constraints.Constraints, lsst.daf.butler.core.constraints.ConstraintsConfig, lsst.daf.butler.core.constraints.ConstraintsValidationError, lsst.daf.butler.core.dimensions._coordinate.DataCoordinate, lsst.daf.butler.core.dimensions._dataCoordinateIterable.DataCoordinateIterable, lsst.daf.butler.core.dimensions._dataCoordinateIterable.DataCoordinateSequence, lsst.daf.butler.core.dimensions._dataCoordinateIterable.DataCoordinateSet, lsst.daf.butler.core.dimensions._database.DatabaseDimension, lsst.daf.butler.core.dimensions._database.DatabaseDimensionCombination, lsst.daf.butler.core.dimensions._database.DatabaseDimensionElement, lsst.daf.butler.core.dimensions._database.DatabaseTopologicalFamily, lsst.daf.butler.core.datasets.association.DatasetAssociation, lsst.daf.butler.core.storageClassDelegate.DatasetComponent, lsst.daf.butler.registry.interfaces._datasets.DatasetIdGenEnum, lsst.daf.butler.core.datasets.ref.DatasetRef, lsst.daf.butler.core.datasets.type.DatasetType, lsst.daf.butler.core.exceptions.DatasetTypeNotSupportedError, lsst.daf.butler.core.datastore.Datastore, lsst.daf.butler.core.datastoreCacheManager.DatastoreCacheManager, lsst.daf.butler.core.datastoreCacheManager.DatastoreCacheManagerConfig, lsst.daf.butler.core.datastore.DatastoreConfig, lsst.daf.butler.core.datastoreCacheManager.DatastoreDisabledCacheManager, lsst.daf.butler.core.datastore.DatastoreValidationError, lsst.daf.butler._deferredDatasetHandle.DeferredDatasetHandle, lsst.daf.butler.core.dimensions._elements.Dimension, lsst.daf.butler.core.dimensions._elements.DimensionCombination, lsst.daf.butler.core.dimensions._config.DimensionConfig, lsst.daf.butler.core.dimensions._elements.DimensionElement, lsst.daf.butler.core.dimensions._graph.DimensionGraph, lsst.daf.butler.core.dimensions._packer.DimensionPacker, lsst.daf.butler.core.dimensions._records.DimensionRecord, lsst.daf.butler.core.dimensions._universe.DimensionUniverse, lsst.daf.butler.core.fileDataset.FileDataset, lsst.daf.butler.core.fileDescriptor.FileDescriptor, lsst.daf.butler.core.fileTemplates.FileTemplate, lsst.daf.butler.core.fileTemplates.FileTemplateValidationError, lsst.daf.butler.core.fileTemplates.FileTemplates, lsst.daf.butler.core.fileTemplates.FileTemplatesConfig, lsst.daf.butler.core.formatter.Formatter, lsst.daf.butler.core.formatter.FormatterFactory, lsst.daf.butler.core.dimensions._governor.GovernorDimension, lsst.daf.butler.core.location.Location, lsst.daf.butler.core.location.LocationFactory, lsst.daf.butler.core.configSupport.LookupKey, lsst.daf.butler.core.mappingFactory.MappingFactory, lsst.daf.butler.core.named.NameMappingSetView, lsst.daf.butler.core.named.NamedKeyDict, lsst.daf.butler.core.named.NamedKeyMapping, lsst.daf.butler.core.named.NamedValueAbstractSet, lsst.daf.butler.core.named.NamedValueMutableSet, lsst.daf.butler.core.named.NamedValueSet, lsst.daf.butler.core.progress.Progress, lsst.daf.butler._butler.PruneCollectionsArgsError, lsst.daf.butler._butler.PurgeUnsupportedPruneCollectionsError, lsst.daf.butler._butler.PurgeWithoutUnstorePruneCollectionsError, lsst.daf.butler.core.quantum.Quantum, lsst.daf.butler.registry._registry.Registry, lsst.daf.butler.registry._config.RegistryConfig, lsst.daf.butler._butler.RunWithoutPurgePruneCollectionsError, lsst.daf.butler.core.dimensions._coordinate.SerializedDataCoordinate, lsst.daf.butler.core.datasets.ref.SerializedDatasetRef, lsst.daf.butler.core.datasets.type.SerializedDatasetType, lsst.daf.butler.core.dimensions._graph.SerializedDimensionGraph, lsst.daf.butler.core.dimensions._records.SerializedDimensionRecord, lsst.daf.butler.core.simpleQuery.SimpleQuery, lsst.daf.butler.core.dimensions._skypix.SkyPixDimension, lsst.daf.butler.core.dimensions._skypix.SkyPixSystem, lsst.daf.butler.core._topology.SpatialRegionDatabaseRepresentation, lsst.daf.butler.core.storageClass.StorageClass, lsst.daf.butler.core.storageClass.StorageClassConfig, lsst.daf.butler.core.storageClassDelegate.StorageClassDelegate, lsst.daf.butler.core.storageClass.StorageClassFactory, lsst.daf.butler.core.storedFileInfo.StoredDatastoreItemInfo, lsst.daf.butler.core.storedFileInfo.StoredFileInfo, lsst.daf.butler.core.timespan.Timespan, lsst.daf.butler.core.timespan.TimespanDatabaseRepresentation, lsst.daf.butler.core._topology.TopologicalExtentDatabaseRepresentation, lsst.daf.butler.core._topology.TopologicalFamily, lsst.daf.butler.core._topology.TopologicalRelationshipEndpoint, lsst.daf.butler.core._topology.TopologicalSpace, lsst.daf.butler.core.exceptions.ValidationError, lsst.daf.butler.transfers._yaml.YamlRepoExportBackend, lsst.daf.butler.transfers._yaml.YamlRepoImportBackend

lsst.daf.butler.registry Package

Classes

CollectionSearch An ordered search path of collections.
CollectionType Enumeration used to label different types of collections.
ConflictingDefinitionError Exception raised when trying to insert a database record when a conflicting record already exists.
DatasetIdGenEnum This enum is used to specify dataset ID generation options for insert() method.
DbAuth(path, envVar, authList, str]]] = None) Retrieves authentication information for database connections.
DbAuthError A problem has occurred retrieving database authentication information.
DbAuthPermissionsError Credentials file has incorrect permissions.
InconsistentDataIdError Exception raised when a data ID contains contradictory key-value pairs, according to dimension relationships.
MissingCollectionError Exception raised when an operation attempts to use a collection that does not exist.
OrphanedRecordError Exception raised when trying to remove or modify a database record that is still being used in some other table.
Registry Abstract Registry interface.
RegistryConfig([other, validate, …])
RegistryDefaults(collections, run, infer, …) A struct used to provide the default collections searched or written to by a Registry or Butler instance.
UnsupportedIdGeneratorError Exception raised when an unsupported DatasetIdGenEnum option is used for insert/import.

Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.registry.wildcards.CollectionSearch, lsst.daf.butler.registry._collectionType.CollectionType, lsst.daf.butler.registry._exceptions.ConflictingDefinitionError, lsst.daf.butler.registry.interfaces._datasets.DatasetIdGenEnum, lsst.daf.butler.registry._dbAuth.DbAuth, lsst.daf.butler.registry._dbAuth.DbAuthError, lsst.daf.butler.registry._dbAuth.DbAuthPermissionsError, lsst.daf.butler.registry._exceptions.InconsistentDataIdError, lsst.daf.butler.registry._exceptions.MissingCollectionError, lsst.daf.butler.registry._exceptions.OrphanedRecordError, lsst.daf.butler.registry._registry.Registry, lsst.daf.butler.registry._config.RegistryConfig, lsst.daf.butler.registry._defaults.RegistryDefaults, lsst.daf.butler.registry._exceptions.UnsupportedIdGeneratorError

lsst.daf.butler.registry.interfaces Package

Classes

ButlerAttributeExistsError Exception raised when trying to update existing attribute without specifying force option.
ButlerAttributeManager An interface for managing butler attributes in a Registry.
ChainedCollectionRecord(key, name, universe) A subclass of CollectionRecord that adds the list of child collections in a CHAINED collection.
CollectionManager An interface for managing the collections (including runs) in a Registry.
CollectionRecord(key, name, type) A struct used to represent a collection in internal Registry APIs.
Database(*, origin, engine, namespace) An abstract interface that represents a particular database engine’s representation of a single schema/namespace/database.
DatabaseConflictError Exception raised when database content (row values or schema entities) are inconsistent with what this client expects.
DatabaseDimensionOverlapStorage A base class for objects that manage overlaps between a pair of database-backed dimensions.
DatabaseDimensionRecordStorage Intermediate interface for DimensionRecordStorage objects that provide storage for DatabaseDimensionElement instances.
DatasetIdGenEnum This enum is used to specify dataset ID generation options for insert() method.
DatasetRecordStorage(datasetType) An interface that manages the records associated with a particular DatasetType.
DatasetRecordStorageManager An interface that manages the tables that describe datasets.
DatastoreRegistryBridge(datastoreName) An abstract base class that defines the interface that a Datastore uses to communicate with a Registry.
DatastoreRegistryBridgeManager(*, opaque, …) An abstract base class that defines the interface between Registry and Datastore when a new Datastore is constructed.
DimensionRecordStorage An abstract base class that represents a way of storing the records associated with a single DimensionElement.
DimensionRecordStorageManager(*, universe) An interface for managing the dimension records in a Registry.
FakeDatasetRef(id, uuid.UUID]) A fake DatasetRef that can be used internally by butler where only the dataset ID is available.
GovernorDimensionRecordStorage Intermediate interface for DimensionRecordStorage objects that provide storage for GovernorDimension instances.
OpaqueTableStorage(name) An interface that manages the records associated with a particular opaque table in a Registry.
OpaqueTableStorageManager An interface that manages the opaque tables in a Registry.
ReadOnlyDatabaseError Exception raised when a write operation is called on a read-only Database.
RunRecord(key, name, type) A subclass of CollectionRecord that adds execution information and an interface for updating it.
SchemaAlreadyDefinedError Exception raised when trying to initialize database schema when some tables already exist.
SkyPixDimensionRecordStorage Intermediate interface for DimensionRecordStorage objects that provide storage for SkyPixDimension instances.
StaticTablesContext(db) Helper class used to declare the static schema for a registry layer in a database.
VersionTuple Class representing a version number.
VersionedExtension Interface for extension classes with versions.

Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.registry.interfaces._attributes.ButlerAttributeExistsError, lsst.daf.butler.registry.interfaces._attributes.ButlerAttributeManager, lsst.daf.butler.registry.interfaces._collections.ChainedCollectionRecord, lsst.daf.butler.registry.interfaces._collections.CollectionManager, lsst.daf.butler.registry.interfaces._collections.CollectionRecord, lsst.daf.butler.registry.interfaces._database.Database, lsst.daf.butler.registry.interfaces._database.DatabaseConflictError, lsst.daf.butler.registry.interfaces._dimensions.DatabaseDimensionOverlapStorage, lsst.daf.butler.registry.interfaces._dimensions.DatabaseDimensionRecordStorage, lsst.daf.butler.registry.interfaces._datasets.DatasetIdGenEnum, lsst.daf.butler.registry.interfaces._datasets.DatasetRecordStorage, lsst.daf.butler.registry.interfaces._datasets.DatasetRecordStorageManager, lsst.daf.butler.registry.interfaces._bridge.DatastoreRegistryBridge, lsst.daf.butler.registry.interfaces._bridge.DatastoreRegistryBridgeManager, lsst.daf.butler.registry.interfaces._dimensions.DimensionRecordStorage, lsst.daf.butler.registry.interfaces._dimensions.DimensionRecordStorageManager, lsst.daf.butler.registry.interfaces._bridge.FakeDatasetRef, lsst.daf.butler.registry.interfaces._dimensions.GovernorDimensionRecordStorage, lsst.daf.butler.registry.interfaces._opaque.OpaqueTableStorage, lsst.daf.butler.registry.interfaces._opaque.OpaqueTableStorageManager, lsst.daf.butler.registry.interfaces._database.ReadOnlyDatabaseError, lsst.daf.butler.registry.interfaces._collections.RunRecord, lsst.daf.butler.registry.interfaces._database.SchemaAlreadyDefinedError, lsst.daf.butler.registry.interfaces._dimensions.SkyPixDimensionRecordStorage, lsst.daf.butler.registry.interfaces._database.StaticTablesContext, lsst.daf.butler.registry.interfaces._versioning.VersionTuple, lsst.daf.butler.registry.interfaces._versioning.VersionedExtension

lsst.daf.butler.registry.queries Package

Classes

ChainedDatasetQueryResults(chain) A DatasetQueryResults implementation that simply chains together other results objects, each for a different parent dataset type.
DataCoordinateQueryResults(db, query, *, …) An enhanced implementation of DataCoordinateIterable that represents data IDs retrieved from a database query.
DatasetQueryResults An interface for objects that represent the results of queries for datasets.
ParentDatasetQueryResults(db, query, *, …) An object that represents results from a query for datasets with a single parent DatasetType.
Query(*, graph, whereRegion, managers) An abstract base class for queries that return some combination of DatasetRef and DataCoordinate objects.
QueryBuilder(summary, managers) A builder for potentially complex queries that join tables based on dimension relationships.
QuerySummary(requested, *, dataId, …) A struct that holds and categorizes the dimensions involved in a query.
RegistryManagers(collections, datasets, …) Struct used to pass around the manager objects that back a Registry and are used internally by the query system.

Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.registry.queries._results.ChainedDatasetQueryResults, lsst.daf.butler.registry.queries._results.DataCoordinateQueryResults, lsst.daf.butler.registry.queries._results.DatasetQueryResults, lsst.daf.butler.registry.queries._results.ParentDatasetQueryResults, lsst.daf.butler.registry.queries._query.Query, lsst.daf.butler.registry.queries._builder.QueryBuilder, lsst.daf.butler.registry.queries._structs.QuerySummary, lsst.daf.butler.registry.queries._structs.RegistryManagers

lsst.daf.butler.registry.wildcards Module

Classes

CategorizedWildcard(strings, patterns, …) The results of preprocessing a wildcard expression to separate match patterns from strings.
CollectionQuery(search, …) An unordered query for collections and dataset type restrictions.
CollectionSearch An ordered search path of collections.

Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.registry.wildcards.CategorizedWildcard, lsst.daf.butler.registry.wildcards.CollectionQuery, lsst.daf.butler.registry.wildcards.CollectionSearch

Example datastores

lsst.daf.butler.datastores.chainedDatastore Module

Classes
ChainedDatastore(config, str], …) Chained Datastores to allow read and writes from multiple datastores.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.datastores.chainedDatastore.ChainedDatastore

lsst.daf.butler.datastores.inMemoryDatastore Module

Classes
StoredMemoryItemInfo(timestamp, …) Internal InMemoryDatastore Metadata associated with a stored DatasetRef.
InMemoryDatastore(config, str], …) Basic Datastore for writing to an in memory cache.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.datastores.inMemoryDatastore.StoredMemoryItemInfo, lsst.daf.butler.datastores.inMemoryDatastore.InMemoryDatastore

lsst.daf.butler.datastores.fileDatastore Module

Classes
FileDatastore(config, str], bridgeManager, …) Generic Datastore for file-based implementations.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.datastores.fileDatastore.FileDatastore

Example formatters

lsst.daf.butler.formatters.file Module

Classes
FileFormatter(fileDescriptor, dataId, …) Interface for reading and writing files on a POSIX file system.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.formatters.file.FileFormatter

lsst.daf.butler.formatters.json Module

Classes
JsonFormatter(fileDescriptor, dataId, …) Interface for reading and writing Python objects to and from JSON files.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.formatters.json.JsonFormatter

lsst.daf.butler.formatters.matplotlib Module

Classes
MatplotlibFormatter(fileDescriptor, dataId, …) Interface for writing matplotlib figures.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.formatters.matplotlib.MatplotlibFormatter

lsst.daf.butler.formatters.parquet Module

Classes
ParquetFormatter(fileDescriptor, dataId, …) Interface for reading and writing Pandas DataFrames to and from Parquet files.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.formatters.parquet.ParquetFormatter

lsst.daf.butler.formatters.pickle Module

Classes
PickleFormatter(fileDescriptor, dataId, …) Interface for reading and writing Python objects to and from pickle files.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.formatters.pickle.PickleFormatter

lsst.daf.butler.formatters.yaml Module

Classes
YamlFormatter(fileDescriptor, dataId, …) Interface for reading and writing Python objects to and from YAML files.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.formatters.yaml.YamlFormatter

Database backends

lsst.daf.butler.registry.databases.sqlite Module

Classes
SqliteDatabase(*, engine, origin, namespace, …) An implementation of the Database interface for SQLite3.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.registry.databases.sqlite.SqliteDatabase

lsst.daf.butler.registry.databases.postgresql Module

Classes
PostgresqlDatabase(*, engine, origin, …) An implementation of the Database interface for PostgreSQL.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.registry.databases.postgresql.PostgresqlDatabase

Support API

lsst.daf.butler.core.utils Module

Functions
allSlots(self) Return combined __slots__ for all classes in objects mro.
getClassOf(typeOrName, str]) Given the type name or a type, return the python type.
getFullTypeName(cls) Return full type name of the supplied entity.
getInstanceOf(typeOrName, str], *args, **kwargs) Given the type name or a type, instantiate an object of that type.
immutable(cls) Decorate a class to simulates a simple form of immutability.
iterable(a) Make input iterable.
safeMakeDir(directory) Make a directory in a manner avoiding race conditions.
stripIfNotNone(s) Strip leading and trailing whitespace if the given object is not None.
transactional(func) Decorate a method and makes it transactional.
Classes
Singleton Metaclass to convert a class to a Singleton.
Class Inheritance Diagram

Inheritance diagram of lsst.daf.butler.core.utils.Singleton

lsst.daf.butler.core.repoRelocation Module

Functions
replaceRoot(configRoot, butlerRoot, str, None]) Update a configuration root with the butler root location.
Variables
BUTLER_ROOT_TAG The special string to be used in configuration files to indicate that the butler root location should be used.

Test utilities

lsst.daf.butler.tests Package

Functions

addDataIdValue(butler, dimension, value, …) Add a new data ID to a repository.
addDatasetType(butler, name, dimensions, …) Add a new dataset type to a repository.
expandUniqueId(butler, partialId, Any]) Return a complete data ID matching some criterion.
makeTestCollection(repo, uniqueId) Create a read/write Butler to a fresh collection.
makeTestRepo(root, dataIds, …) Create an empty test repository.
registerMetricsExample(butler) Modify a repository to support reading and writing MetricsExample objects.

Classes

BadNoWriteFormatter(fileDescriptor, dataId, …) A formatter that always fails without writing anything.
BadWriteFormatter(fileDescriptor, dataId, …) A formatter that never works but does leave a file behind.
CliCmdTestBase A test case base that is used to verify click command functions import and call their respective script functions correctly.
CliLogTestBase Tests log initialization, reset, and setting log levels.
DatasetTestHelper Helper methods for Datasets
DatastoreMock Mocks a butler datastore.
DatastoreTestHelper Helper methods for Datastore tests
DummyRegistry() Dummy Registry, for Datastore test purposes.
ListDelegate(storageClass) Parameter handler for list parameters
MetricsDelegate(storageClass) Parameter handler for parameters using Metrics
MetricsExample([summary, output, data]) Smorgasboard of information that might be the result of some processing.
MultiDetectorFormatter(fileDescriptor, …)