API Reference#

importlib_metadata module#

class importlib_metadata.Distribution(*args, **kwargs)#

Bases: DeprecatedNonAbstract

A Python distribution package.

static at(path: str | PathLike[str]) Distribution#

Return a Distribution for the indicated metadata path


path – a string or path-like object


a concrete Distribution instance for the path

classmethod discover(**kwargs) Iterable[Distribution]#

Return an iterable of Distribution objects for all packages.

Pass a context or pass keyword arguments for constructing a context.


A DistributionFinder.Context object.


Iterable of Distribution objects for all packages.

property entry_points: EntryPoints#
property files: List[PackagePath] | None#

Files in this distribution.


List of PackagePath for this distribution or None

Result is None if the metadata file that enumerates files (i.e. RECORD for dist-info, or installed-files.txt or SOURCES.txt for egg-info) is missing. Result may be empty if the metadata exists but is empty.

classmethod from_name(name: str) Distribution#

Return the Distribution for the given package name.


name – The name of the distribution package to search for.


The Distribution instance (or subclass thereof) for the named package, if found.

  • PackageNotFoundError – When the named package’s distribution metadata cannot be found.

  • ValueError – When an invalid value is supplied for name.

abstract locate_file(path: str | PathLike[str]) Path#

Given a path to a file in this distribution, return a path to it.

property metadata: PackageMetadata#

Return the parsed metadata for this Distribution.

The returned object will have keys that name the various bits of metadata. See PEP 566 for details.

property name: str#

Return the ‘Name’ metadata for the distribution package.

abstract read_text(filename) str | None#

Attempt to load metadata file given by the name.


filename – The name of the file in the distribution info.


The text if found, otherwise None.

property requires: List[str] | None#

Generated requirements specified for this Distribution

property version: str#

Return the ‘Version’ metadata for the distribution package.

class importlib_metadata.DistributionFinder#

Bases: MetaPathFinder

A MetaPathFinder capable of discovering installed distributions.

class Context(**kwargs)#

Bases: object

Keyword arguments presented by the caller to distributions() or Distribution.discover() to narrow the scope of a search for distributions in all DistributionFinders.

Each DistributionFinder may expect any parameters and should attempt to honor the canonical parameters defined below when appropriate.

name = None#

Specific name for which a distribution finder should match. A name of None matches all distributions.

property path: List[str]#

The sequence of directory path that a distribution finder should search.

Typically refers to Python installed package paths such as “site-packages” directories and defaults to sys.path.

abstract find_distributions(context=Context()) Iterable[Distribution]#

Find distributions.

Return an iterable of all Distribution instances capable of loading the metadata for packages matching the context, a DistributionFinder.Context instance.

class importlib_metadata.PackageMetadata(*args, **kwargs)#

Bases: Protocol

get(name: str, failobj: None = None) str | None#
get(name: str, failobj: _T) str | _T

Helper for @overload to raise when called.

get_all(name: str, failobj: None = None) List[Any] | None#
get_all(name: str, failobj: _T) List[Any] | _T

Helper for @overload to raise when called.

property json: Dict[str, str | List[str]]#

A JSON-compatible form of the metadata.

exception importlib_metadata.PackageNotFoundError#

Bases: ModuleNotFoundError

The package was not found.

property name: str#

module name

importlib_metadata.distribution(distribution_name: str) Distribution#

Get the Distribution instance for the named package.


distribution_name – The name of the distribution package as a string.


A Distribution instance (or subclass thereof).

importlib_metadata.distributions(**kwargs) Iterable[Distribution]#

Get all Distribution instances in the current environment.


An iterable of Distribution instances.

importlib_metadata.entry_points(**params) EntryPoints#

Return EntryPoint objects for all installed packages.

Pass selection parameters (group or name) to filter the result to entry points matching those properties (see EntryPoints.select()).


EntryPoints for all installed packages.

importlib_metadata.files(distribution_name: str) List[PackagePath] | None#

Return a list of files for the named package.


distribution_name – The name of the distribution package to query.


List of files composing the distribution.

importlib_metadata.metadata(distribution_name: str) PackageMetadata#

Get the metadata for the named package.


distribution_name – The name of the distribution package to query.


A PackageMetadata containing the parsed metadata.

importlib_metadata.packages_distributions() Mapping[str, List[str]]#

Return a mapping of top-level packages to their distributions.

>>> import collections.abc
>>> pkgs = packages_distributions()
>>> all(isinstance(dist, collections.abc.Sequence) for dist in pkgs.values())
importlib_metadata.requires(distribution_name: str) List[str] | None#

Return a list of requirements for the named package.


An iterable of requirements, suitable for packaging.requirement.Requirement.

importlib_metadata.version(distribution_name: str) str#

Get the version string for the named package.


distribution_name – The name of the distribution package to query.


The version string for the package as defined in the package’s “Version” metadata key.