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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