code: def walk_code(co, _prefix=''):
      
      name = _prefix + co.co_name
      yield name, co
      yield from chain.from_iterable(
          walk_code(c, _prefix=_extend_name(name, co))
          for c in co.co_consts
          if isinstance(c, CodeType)
      )
docs: Traverse a code object, finding all consts which are also code objects.
  
      Yields pairs of (name, code object).