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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def UpdateUserCredentials(client_id, client_secret, refresh_token, adwords_manager_cid, developer_token):
 """Update the credentials associated with application user. Args: client_id: str Client Id retrieved from the developer's console. client_secret: str Client Secret retrieved from the developer's console. refresh_token: str Refresh token generated with the above client id/secret. adwords_manager_cid: str Customer Id for the AdWords manager account. developer_token: str Developer Token for the AdWords account. """

  app_user = AppUser.query(AppUser.user == users.get_current_user()).fetch()[0]

  app_user.client_id = client_id
  app_user.client_secret = client_secret
  app_user.refresh_token = refresh_token
  app_user.adwords_manager_cid = adwords_manager_cid
  app_user.developer_token = developer_token

  app_user.put()