code: def has_env_vars(*env_vars):
      
      for env_var in env_vars:
          if not os.environ.get(env_var):
              msg = (
                  'Must set {} environment variable. View docs for setting up environment at {}'
              ).format(env_var, temple.constants.TEMPLE_DOCS_URL)
              raise temple.exceptions.InvalidEnvironmentError(msg)
docs: Raises `InvalidEnvironmentError` when one isnt set