TypeError: expected str, bytes or os.PathLike object, not tuple with os.path.basename
The error is because of the following:
askopenfilenamesreturns a tuple of filenames, even if there's only one- you are passing the result of
askopenfilenamestoos.path.basename, but that function expects a single filename
That is why you get the error expected str, bytes, or os.PathLike object, not tuple: you are passing a tuple and the error message says you can't do that.