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-rw-r--r--pkg_resources.py11
1 files changed, 11 insertions, 0 deletions
diff --git a/pkg_resources.py b/pkg_resources.py
index a3eef28f..8fec29e1 100644
--- a/pkg_resources.py
+++ b/pkg_resources.py
@@ -2303,6 +2303,17 @@ class Distribution(object):
def parsed_version(self):
if not hasattr(self, "_parsed_version"):
self._parsed_version = parse_version(self.version)
+ if isinstance(
+ self._parsed_version, packaging.version.LegacyVersion):
+ warnings.warn(
+ "'%s (%s)' is being parsed as a legacy, non PEP 440, "
+ "version. You may find odd behavior and sort order. In "
+ "particular it will be sorted as less than 0.0. It is "
+ "recommend to migrate to PEP 440 compatible versions." % (
+ self.project_name, self.version,
+ ),
+ RuntimeWarning,
+ )
return self._parsed_version