In the documentation it is said that os.path.isdir(...) an Path(...).is_dir()are equivalent substitutes.
https://docs.python.org/3/library/pathlib.html#correspondence-to-tools-in-the-os-module

But they give different result for empty path strings:
>>> import os
>>> from pathlib import Path
>>> dummy = "" 
>>> os.path.isdir(dummy)
 False

Obviously it's not an equivalence, so either this should be noted in the documentation or corrected in the code.