More clarification on the name

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

@@ -218,7 +218,8 @@ class RequiresPythonCandidate(Candidate):
     @property
     def name(self):
         # type: () -> str
-        return "<Python>"  # Avoid conflicting with the PyPI package "Python".
+        # Avoid conflicting with the PyPI package "Python".
+        return "<Python fom Requires-Python>"
 
     @property
     def version(self):

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

@@ -35,10 +35,13 @@ class ExplicitRequirement(Requirement):
 
 class NoMatchRequirement(Requirement):
     """A requirement that never matches anything.
+
+    Note: Similar to ExplicitRequirement, the caller should handle name
+    canonicalisation; this class does not perform it.
     """
     def __init__(self, name):
         # type: (str) -> None
-        self._name = canonicalize_name(name)
+        self._name = name
 
     @property
     def name(self):