code: def serialize_func_name(func):
      
      if func.__module__ == '__main__':
          raise ValueError('Functions from the __main__ module cannot be '
                           'processed by workers.')
      try:
          # This will only work on Python 3.3 or above, but it will allow us to use static/classmethods
          func_name = func.__qualname__
      except AttributeError:
          func_name = func.__name__
      return ':'.join([func.__module__, func_name])
docs: Returns the dotted serialized path to the passed function.