code: def is_classvar(tp):
      
      if NEW_TYPING:
          return (tp is ClassVar or
                  isinstance(tp, _GenericAlias) and tp.__origin__ is ClassVar)
      try:
          from typing import _ClassVar
          return type(tp) is _ClassVar
      except:
          # SMA: support for very old typing module <=3.5.3
          return False
docs: Test if the type represents a class variable. Examples::
  
          is_classvar(int) == False
          is_classvar(ClassVar) == True
          is_classvar(ClassVar[int]) == True
          is_classvar(ClassVar[List[T]]) == True