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feat: improve typing in on_exception #183

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feat: improve typing in on_exception #183

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7 changes: 4 additions & 3 deletions backoff/_decorator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
import asyncio
import logging
import operator
from typing import Any, Callable, Iterable, Optional, Type, Union
from typing import Any, Callable, Iterable, Optional, Type, TypeVar, Union

from backoff._common import (
_prepare_logger,
Expand Down Expand Up @@ -119,14 +119,15 @@ def decorate(target):
# Return a function which decorates a target with a retry loop.
return decorate

ET = TypeVar("ET", bound=Exception)

def on_exception(wait_gen: _WaitGenerator,
exception: _MaybeSequence[Type[Exception]],
exception: _MaybeSequence[Type[ET]],
*,
max_tries: Optional[_MaybeCallable[int]] = None,
max_time: Optional[_MaybeCallable[float]] = None,
jitter: Union[_Jitterer, None] = full_jitter,
giveup: _Predicate[Exception] = lambda e: False,
giveup: _Predicate[ET] = lambda e: False,
on_success: Union[_Handler, Iterable[_Handler], None] = None,
on_backoff: Union[_Handler, Iterable[_Handler], None] = None,
on_giveup: Union[_Handler, Iterable[_Handler], None] = None,
Expand Down