new check: suggest to iterate over dict.values() instead if items() if

[spaceone]

B007 unused-loop-control-variable revealed and fixed code like:

-               for k, v in self.validation_errors.items():
+               for _k, v in self.validation_errors.items():
                        num += v.number_of_errors()

a new checker could make it even better:

-               for k, v in self.validation_errors.items():
+               for v in self.validation_errors.values():
                        num += v.number_of_errors()

[andersk]

Some classes such as xml.etree.elementtree.Element support items but not values.

[JonathanPlasse]

It would be an aggressive rule.

[dhruvmanila]

This is being implemented as part of perflint (#4789)

[charliermarsh]

I believe we now support this via PERF102.