Python Canvas Create Migration

import requests

token='your token here'

def migrateContents(old_course_id, new_course_id):
    payload={'migration_type':'course_copy_importer','settings[source_course_id]': str(old_course), 'date_shift_options[remove_dates]': 'True'}
    r = requests.post('https://xxxx.instructure.com/api/v1/courses/'+ str(new_course)+ '/content_migrations/', params=payload, headers = {'Authorization': 'Bearer ' + token})
    data = r.json()
    #print data
    progress_url = data[u'progress_url']
    print "Migration URL is: " + str(progress_url)

    progress = 0
    while progress != 100:
        progress_check = requests.get(progress_url, headers = {'Authorization': 'Bearer ' + token})
        progress_result = progress_check.json()
        print "Migration Status is: " + str(data[u'workflow_state']) + ", | progress: " + str(progress_result[u'completion']) + "%"
        #print progress_result
        progress = progress_result[u'completion']

        time.sleep(20)

        if progress_result[u'completion'] == 100:
            print "------------------------------"
            print "Migration completed."
            break