Don't cache _version

Author: stefanor

src/pip/_internal/metadata/pkg_resources.py

@@ -17,7 +17,6 @@ class Distribution(BaseDistribution):
     def __init__(self, dist):
         # type: (pkg_resources.Distribution) -> None
         self._dist = dist
-        self._version = None
 
     @classmethod
     def from_wheel(cls, path, name):
@@ -47,9 +46,7 @@ def canonical_name(self):
     @property
     def version(self):
         # type: () -> _BaseVersion
-        if self._version is None:
-            self._version = parse_version(self._dist.version)
-        return self._version
+        return parse_version(self._dist.version)
 
     @property
     def installer(self):

src/pip/_internal/resolution/resolvelib/candidates.py

@@ -347,7 +347,6 @@ def __init__(
         self.dist = dist
         self._ireq = make_install_req_from_dist(dist, template)
         self._factory = factory
-        self._version = None
 
         # This is just logging some messages, so we can do it eagerly.
         # The returned dist would be exactly the same as self.dist because we
@@ -390,9 +389,7 @@ def name(self):
     @property
     def version(self):
         # type: () -> _BaseVersion
-        if self._version is None:
-            self._version = parse_version(self.dist.version)
-        return self._version
+        return parse_version(self.dist.version)
 
     @property
     def is_editable(self):