I am trying to figure out how to upload songs to Spotify using python. I know that it is possible to upload local mp3 files to spotify, and then take them everywhere. Is this not supported by any python spotify api? I have looked at them all and can't seem to find any feature like this one. In particular, with spotipy api. I would ask them directly but they said for questions to post on stack overflow.
You are right, there is no support to upload personal library via API at this moment. Spotify mentions this in the limitation.
It is not currently possible to add local files to playlists using the Web API, but they can be reordered or removed.
It is also unlikely happening in the future. Hope this helps.