Get all Android device IDs tied to a Google Play Music account.

getdevices.py

from gmusicapi import Webclient

# Use Google account credintials. If two factor is enabled, use application specific password.
email = 'user@gmail.com'
password = 'password'

api = Webclient()
logged_in = api.login(email, password)

# logged_in is True if login was successful
if logged_in == True:
    print "Successfully logged in"
    print "Your device IDs are:"
    devices = api.get_registered_devices()
    print [device['id'][2:] + " (" + device['model'] + ")" for device in devices
          if device['type'] == 'PHONE']
else:
    print "Invalid login credintials"