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I found pycharms "find usages" to be extremely useful. Im assuming the jetbrains ruby version would have something very equivalent.

It's not 100% reliable though. There are plenty of ways to resolve a Python symbol at runtime with no way to statically resolve it.

Honestly, at least in modern PHP, people just avoid using that level of dynamicness or explicitly annotate it where possible.

I will require changes in code reviews if PhpStorm cannot analyze usages in your code.