spotipy API base-62 error for adding track to playlist

[aannkkuurr]

Hi, I'm running into an error using the `spotipy` package. It seems to say that the playlist ID or track ID isn't valid, but I can visit the link to both and they work. Unsure what I'm doing wrong.

import requests
import os
import spotipy
from spotipy.oauth2 import SpotifyOAuth

os.environ['SPOTIPY_CLIENT_ID'] = '$MY_CLIENT_ID'
os.environ['SPOTIPY_CLIENT_SECRET'] = '$MY_CLIENT_SECRET'
os.environ['SPOTIPY_REDIRECT_URI'] = 'http://localhost'

scope = "playlist-modify-public playlist-modify-private user-library-modify"
sp = spotipy.Spotify(auth_manager=SpotifyOAuth(scope=scope))
sp.playlist_add_items('7AatTbqsTPhQ4bTRDqXaQH', '6nz35DNIzbtj5ztpDEcW1j')

This gives the following error:

>>> sp.playlist_add_items('7AatTbqsTPhQ4bTRDqXaQH', '6nz35DNIzbtj5ztpDEcW1j')
HTTP Error for POST to https://api.spotify.com/v1/playlists/7AatTbqsTPhQ4bTRDqXaQH/tracks with Params: {'position': None} returned 400 due to Invalid base62 id
Traceback (most recent call last):
  File ".../.venv/lib/python3.11/site-packages/spotipy/client.py", line 271, in _internal_call
    response.raise_for_status()
  File ".../.venv/lib/python3.11/site-packages/requests/models.py", line 1021, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://api.spotify.com/v1/playlists/7AatTbqsTPhQ4bTRDqXaQH/tracks

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File ".../.venv/lib/python3.11/site-packages/spotipy/client.py", line 1085, in playlist_add_items
    return self._post(
           ^^^^^^^^^^^
  File ".../.venv/lib/python3.11/site-packages/spotipy/client.py", line 328, in _post
    return self._internal_call("POST", url, payload, kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.11/site-packages/spotipy/client.py", line 293, in _internal_call
    raise SpotifyException(
spotipy.exceptions.SpotifyException: http status: 400, code:-1 - https://api.spotify.com/v1/playlists/7AatTbqsTPhQ4bTRDqXaQH/tracks:
 Invalid base62 id, reason: None

[Ximzend]

In the documentation you can read:

items - a list of track/episode URIs or URLs

You can try to add [ and ] around the track id. If that doesn't fix it fully, you should also add spotify:track: to each id.