`dist_meta.distributions`¶

Iterate over installed distributions.

Third-party distributions are installed into Python’s site-packages directory with tools such as pip. Distributions must have a *.dist-info directory (as defined by PEP 566) to be discoverable.

Functions:

`get_distribution`(name[, path])	Returns a `Distribution` instance for the distribution with the given name.
`iter_distributions`([path])	Returns an iterator over installed distributions on `path`.
`packages_distributions`([path])	Returns a mapping of top-level packages to a list of distributions which provide them.

Classes:

`DistributionType`()	Abstract base class for `Distribution`-like objects.
`Distribution`(name, version, path)	Represents an installed Python distribution.
`WheelDistribution`(name, version, path, wheel_zip)	Represents a Python distribution in wheel form.

Exceptions:

DistributionNotFoundError

Raised when a distribution cannot be located.

Data:

_DT

Invariant TypeVar bound to dist_meta.distributions.DistributionType.

get_distribution(name, path=None)[source]¶

Returns a Distribution instance for the distribution with the given name.

Parameters

name (str)
path (Optional[Iterable[Union[str, Path, PathLike]]]) – The directories entries to search for distributions in. Default sys.path.

Return type

Distribution

iter_distributions(path=None)[source]¶

Returns an iterator over installed distributions on path.

Parameters: path (Optional[Iterable[Union[str, Path, PathLike]]]) – The directories entries to search for distributions in. Default sys.path.
Return type: Iterator[Distribution]

packages_distributions(path=None)[source]¶

Returns a mapping of top-level packages to a list of distributions which provide them.

The same top-level package may be provided by multiple distributions, especially in the case of namespace packages.

Parameters: path (Optional[Iterable[Union[str, Path, PathLike]]]) – The directories entries to search for distributions in. Default sys.path.

New in version 0.7.0.

Example:

>>> import collections.abc
>>> pkgs = packages_distributions()
>>> all(isinstance(dist, collections.abc.Sequence) for dist in pkgs.values())
True

Return type: Mapping[str, List[str]]

class DistributionType[source]¶

Abstract base class for Distribution-like objects.

Changed in version 0.3.0: Previously was a Union representing Distribution and WheelDistribution. Now a common base class for those two classes, and custom classes providing the same API

This class implements most of the collections.namedtuple() API. Subclasses must implement _fields (as a tuple of field names) and the tuple interface (specifically __iter__ and __getitem__).

Attributes:

`name`	The name of the distribution.
`version`	The version number of the distribution.
`_fields`	A tuple of field names for the “namedtuple”.
`_field_defaults`	A mapping of field names to default values.

Methods:

`read_file`(filename)	Read a file from the `*.dist-info` directory and return its content.
`has_file`(filename)	Returns whether the `*.dist-info` directory contains a file named `filename`.
`_asdict`()	Return a new dict which maps field names to their values.
`_replace`(**kwargs)	Make a new `DistributionType` object, of the same type as this one, replacing the specified fields with new values.
`_make`(iterable)	Make a new `DistributionType` object, of the same type as this one, from a sequence or iterable.
`get_entry_points`()	Returns a mapping of entry point groups to entry points.
`get_metadata`()	Returns the content of the `*.dist-info/METADATA` file.
`get_wheel`()	Returns the content of the `*.dist-info/WHEEL` file, or `None` if the file does not exist.
`get_record`()	Returns the parsed content of the `*.dist-info/RECORD` file, or `None` if the file does not exist.
`__repr__`()	Returns a string representation of the `DistributionType`.

name¶

Type: str

The name of the distribution. No normalization is performed.

version¶

Type: Version

The version number of the distribution.

_fields¶

Type: Tuple[str, …]

A tuple of field names for the “namedtuple”.

_field_defaults¶

Type: Dict[str, Any]

A mapping of field names to default values.

abstract read_file(filename)[source]¶

Read a file from the *.dist-info directory and return its content.

Parameters: filename (str)
Return type: str

abstract has_file(filename)[source]¶

Returns whether the *.dist-info directory contains a file named filename.

Parameters: filename (str)
Return type: bool

_asdict()[source]¶

Return a new dict which maps field names to their values.

Return type: Dict[str, Any]

_replace(**kwargs)[source]¶

Make a new DistributionType object, of the same type as this one, replacing the specified fields with new values.

Parameters: iterable
Return type: ~_DT

classmethod _make(iterable)[source]¶

Make a new DistributionType object, of the same type as this one, from a sequence or iterable.

Parameters: iterable
Return type: ~_DT

get_entry_points()[source]¶

Returns a mapping of entry point groups to entry points.

Entry points in the group are contained in a dictionary mapping entry point names to objects.

dist_meta.entry_points.EntryPoint objects can be constructed as follows:

for name, epstr in distro.get_entry_points().get("console_scripts", {}).items():
    EntryPoint(name, epstr)

Return type: Dict[str, Dict[str, str]]

get_metadata()[source]¶

Returns the content of the *.dist-info/METADATA file.

Return type: MetadataMapping

get_wheel()[source]¶

Returns the content of the *.dist-info/WHEEL file, or None if the file does not exist.

The file will only be present if the distribution was installed from a wheel.

Return type: Optional[MetadataMapping]

get_record()[source]¶

Returns the parsed content of the *.dist-info/RECORD file, or None if the file does not exist.

Return type: Optional[List[RecordEntry]]
Returns: A dist_meta.record.RecordEntry object for each line in the record (i.e. each file in the distribution). This includes files in the *.dist-info directory.

__repr__()[source]¶

Returns a string representation of the DistributionType.

Return type: str

namedtuple Distribution(name, version, path)[source]¶

Bases: DistributionType

Represents an installed Python distribution.

Fields

name (str) – The name of the distribution.
version (Version) – The version number of the distribution.
path (PathPlus) – The path to the *.dist-info directory in the file system.

classmethod from_path(path)[source]¶

Construct a Distribution from a filesystem path to the *.dist-info directory.

Parameters: path (Union[str, Path, PathLike])
Return type: Distribution

read_file(filename)[source]¶

Read a file from the *.dist-info directory and return its content.

Parameters: filename (str)
Return type: str

has_file(filename)[source]¶

Returns whether the *.dist-info directory contains a file named filename.

Parameters: filename (str)
Return type: bool

get_record()[source]¶

Returns the parsed content of the *.dist-info/RECORD file, or None if the file does not exist.

Return type: Optional[List[RecordEntry]]
Returns: A dist_meta.record.RecordEntry object for each line in the record (i.e. each file in the distribution). This includes files in the *.dist-info directory.

namedtuple WheelDistribution(name, version, path, wheel_zip)[source]¶

Bases: DistributionType

Represents a Python distribution in wheel form.

Fields

name (str) – The name of the distribution.
version (Version) – The version number of the distribution.
path (PathPlus) – The path to the .whl file.
wheel_zip (ZipFile) – The opened zip file.

A WheelDistribution can be used as a contextmanager, which will close the underlying zipfile.ZipFile when exiting the with block.

classmethod from_path(path, **kwargs)[source]¶

Construct a WheelDistribution from a filesystem path to the .whl file.

Parameters

path (Union[str, Path, PathLike])
**kwargs – Additional keyword arguments passed to zipfile.ZipFile.

Return type

WheelDistribution

read_file(filename)[source]¶

Read a file from the *.dist-info directory and return its content.

Parameters: filename (str)
Return type: str

has_file(filename)[source]¶

Returns whether the *.dist-info directory contains a file named filename.

Parameters: filename (str)
Return type: bool

get_wheel()[source]¶

Returns the content of the *.dist-info/WHEEL file.

Raises: FileNotFoundError – if the file does not exist.
Return type: MetadataMapping

get_record()[source]¶

Returns the parsed content of the *.dist-info/RECORD file, or None if the file does not exist.

Return type: List[RecordEntry]
Returns: A dist_meta.record.RecordEntry object for each line in the record (i.e. each file in the distribution). This includes files in the *.dist-info directory.
Raises: FileNotFoundError – if the file does not exist.

exception DistributionNotFoundError[source]¶

Bases: ValueError

Raised when a distribution cannot be located.

_DT = TypeVar(_DT, bound=DistributionType)¶

Type: TypeVar

Invariant TypeVar bound to dist_meta.distributions.DistributionType.

dist_meta.distributions¶

`dist_meta.distributions`¶