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Lazily prepare distribution for candidate #13239

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Lazily prepare distribution for candidate #13239

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11 changes: 9 additions & 2 deletions src/pip/_internal/resolution/resolvelib/candidates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -138,7 +138,6 @@ class exposes appropriate information to the resolver.
found remote link (e.g. from pypi.org).
"""

dist: BaseDistribution
is_installed = False

def __init__(
Expand All @@ -156,9 +155,17 @@ def __init__(
self._ireq = ireq
self._name = name
self._version = version
self.dist = self._prepare()
self._dist: Optional[BaseDistribution] = None
self._hash: Optional[int] = None

@property
def dist(self) -> BaseDistribution:
if self._dist is not None:
return self._dist

self._dist = self._prepare()
return self._dist

def __str__(self) -> str:
return f"{self.name} {self.version}"

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