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ðŸ“ ..
ðŸ“„ __init__.py(0 B)
ðŸ“ __pycache__
ðŸ“„ _log.py(1015 B)
ðŸ“„ appdirs.py(1.63 KB)
ðŸ“„ compat.py(1.84 KB)
ðŸ“„ compatibility_tags.py(5.25 KB)
ðŸ“„ datetime.py(242 B)
ðŸ“„ deprecation.py(3.54 KB)
ðŸ“„ direct_url_helpers.py(3.13 KB)
ðŸ“„ distutils_args.py(1.22 KB)
ðŸ“„ egg_link.py(2.15 KB)
ðŸ“„ encoding.py(1.14 KB)
ðŸ“„ entrypoints.py(1.1 KB)
ðŸ“„ filesystem.py(5.75 KB)
ðŸ“„ filetypes.py(716 B)
ðŸ“„ glibc.py(3.04 KB)
ðŸ“„ hashes.py(4.7 KB)
ðŸ“„ inject_securetransport.py(795 B)
ðŸ“„ logging.py(11.26 KB)
ðŸ“„ misc.py(20.29 KB)
ðŸ“„ models.py(1.17 KB)
ðŸ“„ packaging.py(2.88 KB)
ðŸ“„ parallel.py(3.12 KB)
ðŸ“„ pkg_resources.py(987 B)
ðŸ“„ setuptools_build.py(4.59 KB)
ðŸ“„ subprocess.py(9.82 KB)
ðŸ“„ temp_dir.py(7.48 KB)
ðŸ“„ unpacking.py(8.7 KB)
ðŸ“„ urls.py(1.72 KB)
ðŸ“„ virtualenv.py(3.38 KB)
ðŸ“„ wheel.py(6.02 KB)

Editing: packaging.py

import functools
import logging
from email.message import Message
from email.parser import FeedParser
from typing import Optional, Tuple

from pip._vendor import pkg_resources
from pip._vendor.packaging import specifiers, version
from pip._vendor.packaging.requirements import Requirement
from pip._vendor.pkg_resources import Distribution

from pip._internal.exceptions import NoneMetadataError
from pip._internal.utils.misc import display_path

logger = logging.getLogger(__name__)

def check_requires_python(
    requires_python: Optional[str], version_info: Tuple[int, ...]
) -> bool:
    """
    Check if the given Python version matches a "Requires-Python" specifier.

:param version_info: A 3-tuple of ints representing a Python
        major-minor-micro version to check (e.g. `sys.version_info[:3]`).

:return: `True` if the given Python version satisfies the requirement.
        Otherwise, return `False`.

:raises InvalidSpecifier: If `requires_python` has an invalid format.
    """
    if requires_python is None:
        # The package provides no information
        return True
    requires_python_specifier = specifiers.SpecifierSet(requires_python)

python_version = version.parse(".".join(map(str, version_info)))
    return python_version in requires_python_specifier

def get_metadata(dist: Distribution) -> Message:
    """
    :raises NoneMetadataError: if the distribution reports `has_metadata()`
        True but `get_metadata()` returns None.
    """
    metadata_name = "METADATA"
    if isinstance(dist, pkg_resources.DistInfoDistribution) and dist.has_metadata(
        metadata_name
    ):
        metadata = dist.get_metadata(metadata_name)
    elif dist.has_metadata("PKG-INFO"):
        metadata_name = "PKG-INFO"
        metadata = dist.get_metadata(metadata_name)
    else:
        logger.warning("No metadata found in %s", display_path(dist.location))
        metadata = ""

if metadata is None:
        raise NoneMetadataError(dist, metadata_name)

feed_parser = FeedParser()
    # The following line errors out if with a "NoneType" TypeError if
    # passed metadata=None.
    feed_parser.feed(metadata)
    return feed_parser.close()

def get_installer(dist: Distribution) -> str:
    if dist.has_metadata("INSTALLER"):
        for line in dist.get_metadata_lines("INSTALLER"):
            if line.strip():
                return line.strip()
    return ""

@functools.lru_cache(maxsize=512)
def get_requirement(req_string: str) -> Requirement:
    """Construct a packaging.Requirement object with caching"""
    # Parsing requirement strings is expensive, and is also expected to happen
    # with a low diversity of different arguments (at least relative the number
    # constructed). This method adds a cache to requirement object creation to
    # minimize repeated parsing of the same string to construct equivalent
    # Requirement objects.
    return Requirement(req_string)

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