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

[torsava]

@torsava commented on this pull request.



>                      else:
-                        dep_normalized_name = dep.key
+                        dep_normalized_name = dep.key.replace('_', '-')

The newest version looks good to me, and tests are passing.

The [documentation for pkg_resources](https://setuptools.readthedocs.io/en/latest/pkg_resources.html) says about `key`: An all-lowercase version of the project_name, useful for comparison or indexing.
>From there you have to look up `project_name` and then `safe_name` function which generates it. So if we go by documentation, dots are not allowed in `key`. However, if you actually test it, they are there.

What do you think, @hroncok ?

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