code: def get_env():
      
      env = os.getenv('ENV', os.getenv('env', None))
      if env:
          env = env.lower()
      return env
docs: Read environment from ENV and mangle it to a (lower case) representation
      Note: gcdt.utils get_env() is used in many cloudformation.py templates
      :return: Environment as lower case string (or None if not matched)