[Rpm-maint] [rpm-software-management/rpm] pythondistdeps: Switch to importlib.metadata (#1317)

[torsava]

@torsava commented on this pull request.



>  from warnings import warn
 
+try:
+    from importlib.metadata import PathDistribution
+except ImportError:
+    from importlib_metadata import PathDistribution
+
+try:
+    from pathlib import Path
+except ImportError:
+    from pathlib2 import Path
+
+
+class Req(Requirement):
+    @property
+    def key(self):
+        return self.name.lower().replace('_', '-')

To clarify a possible confusion, I think `key` always returned the same thing. But this script had two modes, in legacy mode it used the `key` value, and in pep503 mode it used the `normalize_name` function.

So yes, there are two different methods to convert the name, but that is handled by this script, not by `Requirement.key`.

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