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opt
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alt
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python310
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lib
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python3.10
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site-packages
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pip
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_internal
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utils
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Filename :
packaging.py
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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)