Process and port usage in Linux
Use lsof, fuser, ss, pgrep, pstree, ps, htop, etc. to find process and port usage in Linux.
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Python Type Hints
typing module vs collections module
Since Python 3.9, most of types in typing module is deprecated, and collections module is recommended.
Some types like: typing.Any, typing.Generic, typing.TypeVar, etc. are still not deprecated.