code: def mock_decorator(*a, **k):
      
      # This is a decorator without parameters, e.g.
      #
      # @login_required
      # def some_view(request):
      #     ...
      #
      if a:
          # This could fail in the instance where a callable argument is passed
          # as a parameter to the decorator!
          if callable(a[0]):
              def wrapper(*args, **kwargs):
                  return a[0](*args, **kwargs)
              return wrapper
  
      # This is a decorator with parameters, e.g.
      #
      # @render_template("index.html")
      # def some_view(request):
      #     ...
      #
      def real_decorator(function):
          def wrapper(*args, **kwargs):
              return function(*args, **kwargs)
          return wrapper
      return real_decorator
docs: An pass-through decorator that returns the underlying function.
  
      This is used as the default for replacing decorators.