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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
__init__.py	0 B	-rw-r--r--
_log.py	1015 B	-rw-r--r--
appdirs.py	1.63 KB	-rw-r--r--
compat.py	1.84 KB	-rw-r--r--
compatibility_tags.py	5.25 KB	-rw-r--r--
datetime.py	242 B	-rw-r--r--
deprecation.py	3.54 KB	-rw-r--r--
direct_url_helpers.py	3.13 KB	-rw-r--r--
distutils_args.py	1.22 KB	-rw-r--r--
egg_link.py	2.15 KB	-rw-r--r--
encoding.py	1.14 KB	-rw-r--r--
entrypoints.py	1.1 KB	-rw-r--r--
filesystem.py	5.75 KB	-rw-r--r--
filetypes.py	716 B	-rw-r--r--
glibc.py	3.04 KB	-rw-r--r--
hashes.py	4.7 KB	-rw-r--r--
inject_securetransport.py	795 B	-rw-r--r--
logging.py	11.26 KB	-rw-r--r--
misc.py	20.29 KB	-rw-r--r--
models.py	1.17 KB	-rw-r--r--
packaging.py	2.88 KB	-rw-r--r--
parallel.py	3.12 KB	-rw-r--r--
pkg_resources.py	987 B	-rw-r--r--
setuptools_build.py	4.59 KB	-rw-r--r--
subprocess.py	9.82 KB	-rw-r--r--
temp_dir.py	7.48 KB	-rw-r--r--
unpacking.py	8.94 KB	-rw-r--r--
urls.py	1.72 KB	-rw-r--r--
virtualenv.py	3.38 KB	-rw-r--r--
wheel.py	6.02 KB	-rw-r--r--

Code Editor : 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)

${this.title}

Code Editor : packaging.py