Invalidate cache if the credentials change (or the credentials become invalid) about spotipy HOT 3 OPEN

Your first potential solution would be effective and quite simple to implement. While reading up to this point, I was thinking of something similar.

I'll start working on a new CacheHandler, this shouldn't be too hard.

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So currently there's something similar, but for usernames. Basically the username is appended to the end of the filename.

I'll probably go down a similar route, but reduce the hash length to 7 chars.

I also thought about hijacking the username parameter as it's marked as deprecated, but that just feels wrong if this is supposed to be official :)

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After some internal discussions with @stephanebruckert, we came to the conclusion that this change should be kept for the v3 release, as it would be somewhat difficult and unstable to implement a solution that is also backwards compatible. Also, this problem does not only affect the CacheFileHandler, but pretty much any other cache handler that has some kind of name attribute.

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