from __future__ import annotations
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import functools
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import logging
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from pip._vendor.packaging import specifiers, version
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from pip._vendor.packaging.requirements import Requirement
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logger = logging.getLogger(__name__)
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@functools.lru_cache(maxsize=32)
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def check_requires_python(
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requires_python: str | None, version_info: tuple[int, ...]
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) -> bool:
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"""
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Check if the given Python version matches a "Requires-Python" specifier.
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:param version_info: A 3-tuple of ints representing a Python
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major-minor-micro version to check (e.g. `sys.version_info[:3]`).
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:return: `True` if the given Python version satisfies the requirement.
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Otherwise, return `False`.
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:raises InvalidSpecifier: If `requires_python` has an invalid format.
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"""
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if requires_python is None:
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# The package provides no information
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return True
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requires_python_specifier = specifiers.SpecifierSet(requires_python)
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python_version = version.parse(".".join(map(str, version_info)))
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return python_version in requires_python_specifier
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@functools.lru_cache(maxsize=10000)
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def get_requirement(req_string: str) -> Requirement:
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"""Construct a packaging.Requirement object with caching"""
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# Parsing requirement strings is expensive, and is also expected to happen
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# with a low diversity of different arguments (at least relative the number
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# constructed). This method adds a cache to requirement object creation to
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# minimize repeated parsing of the same string to construct equivalent
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# Requirement objects.
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return Requirement(req_string)
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