import spotipy
from spotipy.oauth2 import SpotifyOAuth
from pprint import pprint
from time import sleep

sp = spotipy.Spotify(client_credentials_manager=SpotifyOAuth(scope="user-read-playback-state,user-modify-playback-state"))

# Shows playing devices
res = sp.devices()
pprint(res)

# Change track
sp.start_playback(uris=['spotify:track:6gdLoMygLsgktydTQ71b15'])

# Change volume
sp.volume(100)
sleep(2)
sp.volume(50)
sleep(2)
sp.volume(100)