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📄 __init__.py(0 B)
📄 __init__.pyc(164 B)
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📁 __pycache__
📄 appdirs.py(1.32 KB)
📄 appdirs.pyc(1.79 KB)
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📄 compat.py(9.27 KB)
📄 compatibility_tags.py(5.31 KB)
📄 datetime.py(295 B)
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📄 deprecation.py(3.24 KB)
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📄 direct_url_helpers.py(4.26 KB)
📄 direct_url_helpers.pyc(3.4 KB)
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📄 distutils_args.py(1.32 KB)
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📄 encoding.py(1.25 KB)
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📄 entrypoints.py(1.19 KB)
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📄 logging.py(12.79 KB)
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📄 misc.py(27.67 KB)
📄 models.py(1.17 KB)
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📄 packaging.py(2.96 KB)
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📄 parallel.py(3.32 KB)
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📄 pkg_resources.py(1.22 KB)
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📄 setuptools_build.py(4.94 KB)
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Editing: packaging.py

from __future__ import absolute_import

import logging
from email.parser import FeedParser

from pip._vendor import pkg_resources
from pip._vendor.packaging import specifiers, version

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

if MYPY_CHECK_RUNNING:
    from typing import Optional, Tuple
    from email.message import Message
    from pip._vendor.pkg_resources import Distribution

logger = logging.getLogger(__name__)

def check_requires_python(requires_python, version_info):
    # type: (Optional[str], 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):
    # type: (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_requires_python(dist):
    # type: (pkg_resources.Distribution) -> Optional[str]
    """
    Return the "Requires-Python" metadata for a distribution, or None
    if not present.
    """
    pkg_info_dict = get_metadata(dist)
    requires_python = pkg_info_dict.get('Requires-Python')

if requires_python is not None:
        # Convert to a str to satisfy the type checker, since requires_python
        # can be a Header object.
        requires_python = str(requires_python)

return requires_python

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

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Editing: packaging.py

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