class_docstr: Type variable.
class_docstr_tok: ["Type","variable","."]
code: def __init_subclass__(cls) -> None:
      raise TypeError(
          f"type '{__name__}.TypeVar' is not an acceptable base type"
      )
  
imports: import abc
  import collections
  import collections.abc
  import functools
  import inspect
  import operator
  import sys
  import types
  import typing
  import warnings
label_desc: Use image node_id 2 for calling the TypeVar obj's underlying member method code with example usage: obj.__init_subclass__(cls) without return types