import portalpy
import requests
import json

#Login Info
username = 'XXXX'
password = 'XXXX'
portal_url = 'https:/somedomain.com/portal'
portal = portalpy.Portal(portal_url, username, password)

#get token
token = portal.generate_token(username, password, expiration=60)

#set new username
new_username = 'newu'
new_password = 'newp'

payload = {'serviceUsername':new_username, 'servicePassword':new_password}

#print  portal.get_folder_id('siteadmin')


#Search for layers
search = portal.search('Feature Service')

for i in search:
    try:
        a = i['url'].split('/')
        folder_id = portal.get_folder_id('siteadmin', a[9])
        post_url = portal.resturl + 'content/users/siteadmin/' + folder_id + '/items/' + i['id'] + '/update'
        print post_url
        post = requests.post(post_url, data =payload)
        print post.status_code
    except Exception:
        pass