old_contents: '''
  Configuration Settings
  '''
  
  ''' Uncomment to configure using the file.
  WARNING: Be careful not to post your account credentials on GitHub.
  
  TWILIO_ACCOUNT_SID = "ACxxxxxxxxxxxxx"
  TWILIO_AUTH_TOKEN = "yyyyyyyyyyyyyyyy"
  TWILIO_APP_SID = "APzzzzzzzzz"
  TWILIO_CALLER_ID = "+17778889999"
  '''
  
  # Begin Heroku configuration - configured through environment variables.
  import os
  TWILIO_ACCOUNT_SID = os.environ.get('TWILIO_ACCOUNT_SID', None)
  TWILIO_AUTH_TOKEN = os.environ.get('TWILIO_AUTH_TOKEN', None)
  TWILIO_CALLER_ID = os.environ.get('TWILIO_CALLER_ID', None)
  TWILIO_APP_SID = os.environ.get('TWILIO_APP_SID', None)
  MONGOLAB_URI = 'mongodb://heroku_app5033310:onqn6daqivk9sekgbivnhp64hm@ds' \
                 '033757.mongolab.com:33757/heroku_app5033310'
new_contents: '''
  Configuration Settings
  '''
  
  ''' Uncomment to configure using the file.
  WARNING: Be careful not to post your account credentials on GitHub.
  
  TWILIO_ACCOUNT_SID = "ACxxxxxxxxxxxxx"
  TWILIO_AUTH_TOKEN = "yyyyyyyyyyyyyyyy"
  TWILIO_APP_SID = "APzzzzzzzzz"
  TWILIO_CALLER_ID = "+17778889999"
  '''
  
  # Begin Heroku configuration - configured through environment variables.
  import os
  TWILIO_ACCOUNT_SID = os.environ.get('TWILIO_ACCOUNT_SID', None)
  TWILIO_AUTH_TOKEN = os.environ.get('TWILIO_AUTH_TOKEN', None)
  TWILIO_CALLER_ID = os.environ.get('TWILIO_CALLER_ID', None)
  TWILIO_APP_SID = os.environ.get('TWILIO_APP_SID', None)
  _
subject: remove MONGOLAB_URI from local settings