code: def get_keys(self):
          
          env = os.environ.get
          if not self.consumer_key:
              self.consumer_key = env('CONSUMER_KEY')
          if not self.consumer_secret:
              self.consumer_secret = env('CONSUMER_SECRET')
          if not self.access_token:
              self.access_token = env('ACCESS_TOKEN')
          if not self.access_token_secret:
              self.access_token_secret = env('ACCESS_TOKEN_SECRET')
  
          if self.config and not (self.consumer_key and
                                  self.consumer_secret and
                                  self.access_token and
                                  self.access_token_secret):
              self.load_config()
docs: Get the Twitter API keys. Order of precedence is command line,
          environment, config file. Return True if all the keys were found
          and False if not.