code: def __call__(self, inst, attr, value):
      if value is None:
          return
  
      self.validator(inst, attr, value)
  
imports: from __future__ import absolute_import, division, print_function
  import re
  from ._make import _AndValidator, and_, attrib, attrs
  from .exceptions import NotCallableError
label_desc: Use image node_id 1 for calling the _OptionalValidator obj's underlying member method code with example usage: obj.__call__(inst, attr, value) without return types