code: def add_constructor(cls, tag, constructor):
      if not "yaml_constructors" in cls.__dict__:
          cls.yaml_constructors = cls.yaml_constructors.copy()
      cls.yaml_constructors[tag] = constructor
  
imports: from .error import *
  from .nodes import *
  import collections.abc, datetime, base64, binascii, re, sys, types
label_desc: Use image node_id 12 for calling the BaseConstructor obj's underlying member method code with example usage: obj.add_constructor(cls, tag, constructor) without return types