code: def run_env_once(f: t.Callable) -> t.Callable:
      
  
      @wraps(f)
      def wrapper(*args, **kwargs):
          has_run = os.environ.get(wrapper.__name__)
          if has_run == '1':
              return
          result = f(*args, **kwargs)
          os.environ[wrapper.__name__] = '1'
          return result
  
      return wrapper
docs: A decorator to prevent ``manage.py`` from running code twice for everything.
      (https://stackoverflow.com/questions/16546652/why-does-django-run-everything-twice)
  
      :param f: function or method to decorate
      :return: callable