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import functools import logging import re from typing import NewType, Optional, Tuple, cast from pip._vendor.packaging import specifiers, version from pip._vendor.packaging.requirements import Requirement NormalizedExtra = NewType("NormalizedExtra", str) logger = logging.getLogger(__name__) @functools.lru_cache(maxsize=32) 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 @functools.lru_cache(maxsize=2048) 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) def safe_extra(extra: str) -> NormalizedExtra: """Convert an arbitrary string to a standard 'extra' name Any runs of non-alphanumeric characters are replaced with a single '_', and the result is always lowercased. This function is duplicated from ``pkg_resources``. Note that this is not the same to either ``canonicalize_name`` or ``_egg_link_name``. """ return cast(NormalizedExtra, re.sub("[^A-Za-z0-9.-]+", "_", extra).lower())