.cache is an illegal location for a cache file and in conflict with the XDG standard

[sigma67]

Describe the bug
Spotipy stores its cache under .cache. If running from a user's home directory, this conflicts with the XDG standard.

https://github.com/spotipy-dev/spotipy/blob/d31969108d462c544f41aba4581a0d84a1e75d6f/spotipy/cache_handler.py#L67C1-L72

Your code

import platformdirs
platformdirs.user_cache_dir()
> '/home/sigma/.cache'

Expected behavior
Default location should be user_cache_dir()/spotipy, .cache-spotipy, or whatever else, just not in conflict with a standard location.

This is a one liner fix and amounts to

if username:
  ...
else:
  cache_path += '-spotipy'

A thorough solution would use platformdirs, but requires adding a dependency:

platformdirs.user_cache_dir(appname="spotipy", appauthor=False, ensure_exists=True).joinpath(".cache")

Output
see above

Environment:
any XDG compliant linux

Additional context
https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

see also #712

[sijanec]

Note that also .cache is created with world read permissions, which is undesirable, as it contains secrets. Please use umask 0007 for sensitive files like this.