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from datetime import datetime
from typing import Any, NoReturn, TypeVar, Union
_T = TypeVar("_T")
def noop(*args: Any, **kw: Any) -> None:
"""No operation. Returns nothing"""
def identity(x: _T) -> _T:
"""Returns argument x"""
return x
def default_now() -> datetime:
return datetime.utcnow()
def default_comparer(x: _T, y: _T) -> bool:
return x == y
def default_sub_comparer(x: Any, y: Any) -> Any:
return x - y
def default_key_serializer(x: Any) -> str:
return str(x)
def default_error(err: Union[Exception, str]) -> NoReturn:
if isinstance(err, BaseException):
raise err
raise Exception(err)
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