[Python-ideas] Path conversion for f-strings

[Batuhan Taskaya]

Like repr and string the file system path is used alot and something like
path!p might be handy.

>>> class MyClass:
...     def __fspath__(self):
...         return "/home/batuhan"
...
>>> assert f"{mc!p}" == f"{os.fspath(mc)}"

Also it saves us to unnecessarily import os for only fspath().
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