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Dir : ~/lib/python3.6/site-packages/pip/utils/

Edit File: packaging.py

from __future__ import absolute_import

from email.parser import FeedParser

import logging
import sys

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

from pip import exceptions

logger = logging.getLogger(__name__)

def check_requires_python(requires_python):
    """
    Check if the python version in use match the `requires_python` specifier.

Returns `True` if the version of python in use matches the requirement.
    Returns `False` if the version of python in use does not matches the
    requirement.

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

# We only use major.minor.micro
    python_version = version.parse('.'.join(map(str, sys.version_info[:3])))
    return python_version in requires_python_specifier

def get_metadata(dist):
    if (isinstance(dist, pkg_resources.DistInfoDistribution) and
            dist.has_metadata('METADATA')):
        return dist.get_metadata('METADATA')
    elif dist.has_metadata('PKG-INFO'):
        return dist.get_metadata('PKG-INFO')

def check_dist_requires_python(dist):
    metadata = get_metadata(dist)
    feed_parser = FeedParser()
    feed_parser.feed(metadata)
    pkg_info_dict = feed_parser.close()
    requires_python = pkg_info_dict.get('Requires-Python')
    try:
        if not check_requires_python(requires_python):
            raise exceptions.UnsupportedPythonVersion(
                "%s requires Python '%s' but the running Python is %s" % (
                    dist.project_name,
                    requires_python,
                    '.'.join(map(str, sys.version_info[:3])),)
            )
    except specifiers.InvalidSpecifier as e:
        logger.warning(
            "Package %s has an invalid Requires-Python entry %s - %s" % (
                dist.project_name, requires_python, e))
        return