1  import sys
   2  from datetime import timedelta
   3  from typing import Union
   4  
   5  if sys.version_info >= (3, 8):
   6      from typing import Literal  # pragma: no cover
   7  else:
   8      from typing_extensions import Literal  # pragma: no cover
   9  
  10  ExpiresDelta = Union[Literal[False], timedelta]
  11  Fresh = Union[bool, float, timedelta]
  12