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[DO-NOT-MERGE] populate requirement.specifier on demand #13323

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[DO-NOT-MERGE] populate requirement.specifier on demand #13323

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7 changes: 6 additions & 1 deletion src/pip/_vendor/packaging/requirements.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
# for complete details.
from __future__ import annotations

from functools import cached_property
from typing import Any, Iterator

from ._parser import parse_requirement as _parse_requirement
Expand Down Expand Up @@ -40,12 +41,16 @@ def __init__(self, requirement_string: str) -> None:
self.name: str = parsed.name
self.url: str | None = parsed.url or None
self.extras: set[str] = set(parsed.extras or [])
self.specifier: SpecifierSet = SpecifierSet(parsed.specifier)
self._raw_specifier = parsed.specifier
self.marker: Marker | None = None
if parsed.marker is not None:
self.marker = Marker.__new__(Marker)
self.marker._markers = _normalize_extra_values(parsed.marker)

@cached_property
def specifier(self) -> SpecifierSet:
return SpecifierSet(self._raw_specifier)

def _iter_parts(self, name: str) -> Iterator[str]:
yield name

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