Gecko [ oric.aiou.edu.pk ]

Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
__about__.py	744 B	-rw-r--r--
__init__.py	562 B	-rw-r--r--
_compat.py	1.11 KB	-rw-r--r--
_structures.py	1.97 KB	-rw-r--r--
_typing.py	1.4 KB	-rw-r--r--
markers.py	9.24 KB	-rw-r--r--
py.typed	0 B	-rw-r--r--
requirements.py	4.75 KB	-rw-r--r--
specifiers.py	30.58 KB	-rw-r--r--
tags.py	23.15 KB	-rw-r--r--
utils.py	1.66 KB	-rw-r--r--
version.py	15.12 KB	-rw-r--r--

Code Editor : _typing.py

"""For neatly implementing static typing in packaging.

`mypy` - the static type analysis tool we use - uses the `typing` module, which
provides core functionality fundamental to mypy's functioning.

Generally, `typing` would be imported at runtime and used in that fashion -
it acts as a no-op at runtime and does not have any run-time overhead by
design.

As it turns out, `typing` is not vendorable - it uses separate sources for
Python 2/Python 3. Thus, this codebase can not expect it to be present.
To work around this, mypy allows the typing import to be behind a False-y
optional to prevent it from running at runtime and type-comments can be used
to remove the need for the types to be accessible directly during runtime.

This module provides the False-y guard in a nicely named fashion so that a
curious maintainer can reach here to read this.

In packaging, all static-typing related imports should be guarded as follows:

from packaging._typing import MYPY_CHECK_RUNNING

if MYPY_CHECK_RUNNING:
        from typing import ...

Ref: https://github.com/python/mypy/issues/3216
"""

MYPY_CHECK_RUNNING = False

if MYPY_CHECK_RUNNING:  # pragma: no cover
    import typing

cast = typing.cast
else:
    # typing's cast() is needed at runtime, but we don't want to import typing.
    # Thus, we use a dummy no-op version, which we tell mypy to ignore.
    def cast(type_, value):  # type: ignore
        return value

${this.title}

Code Editor : _typing.py