code: def gen123():
      yield 1
      yield 2
      yield 3
  
imports: from __future__ import absolute_import
  import sys
  import doctest
  import unittest
  import decimal
  import inspect
  import functools
  import collections
  from collections import defaultdict
  from decorator import dispatch_on, contextmanager, decorator
label_desc: Use image node_id 2 for calling a global function with example usage: gen123() without return types