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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 ''

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 2755
__init__.py File 0 B 0644
appdirs.py File 1.32 KB 0644
compat.py File 9.27 KB 0644
compatibility_tags.py File 5.31 KB 0644
datetime.py File 295 B 0644
deprecation.py File 3.24 KB 0644
direct_url_helpers.py File 4.26 KB 0644
distutils_args.py File 1.32 KB 0644
encoding.py File 1.25 KB 0644
entrypoints.py File 1.13 KB 0644
filesystem.py File 6.78 KB 0644
filetypes.py File 571 B 0644
glibc.py File 3.22 KB 0644
hashes.py File 4.57 KB 0644
inject_securetransport.py File 810 B 0644
logging.py File 12.79 KB 0644
misc.py File 27.34 KB 0644
models.py File 1.17 KB 0644
packaging.py File 2.96 KB 0644
parallel.py File 3.32 KB 0644
pkg_resources.py File 1.22 KB 0644
setuptools_build.py File 4.94 KB 0644
subprocess.py File 9.69 KB 0644
temp_dir.py File 8.18 KB 0644
typing.py File 1.37 KB 0644
unpacking.py File 9.27 KB 0644
urls.py File 1.49 KB 0644
virtualenv.py File 3.62 KB 0644
wheel.py File 7.13 KB 0644