"TypeError: expected str, bytes or os.PathLike object, not WindowsPath" in Windows 10

[daniel-yj-yang]

Bug report

Bug summary

"TypeError: expected str, bytes or os.PathLike object, not WindowsPath" in Windows 10

Code for reproduction

import matplotlib

Actual outcome

...
File "...\matplotlib\__init__.py", line 777, in _open_file_or_url
  fname = os.path.expanduser(fname)
File "...\lib\ntpath.py", line 312, in expanduser
  path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not WindowsPath

Expected outcome

Matplotlib version

• Operating system: Windows 10
• Matplotlib version: 3.3.2
• Matplotlib backend (print(matplotlib.get_backend())):
• Python version: 3.6.4
• Jupyter version (if applicable):
• Other libraries:

[daniel-yj-yang]

Sorry, it appears that the root cause sits in something else in the system. The issue is not reproducible, after rebuilding the user's python libraries.