正如標題所解釋的那樣，我想創建一個常規異常類，以從內置的異常類繼承，這些異常類稍后將在其他類中捕獲。這是我的代碼：from functools import wrapsclass ControlledException(TypeError, AttributeError): """A generic exception on the program's domain."""class WithRetry: def __init__(self, retries_limit=3, allowed_exceptions=None): self.retries_limit = retries_limit self.allowed_exceptions = allowed_exceptions or (ControlledException,) def __call__(self, operation): @wraps(operation) def wrapped(*args, **kwargs): last_raised = None for _ in range(self.retries_limit): try: return operation(*args, **kwargs) except self.allowed_exceptions as e: print(f'retrying {operation.__qualname__} due to {e}') last_raised = e raise last_raised return wrapped@WithRetry()def test(x): x = x + 1 print(x)test('a')ControlledExceptionclass 繼承了兩個異常，我想捕獲它們。在這種情況下，程序將捕獲 .TypeErrorAttributeErrorTypeError我不知道為什么這個參數對（ControlledException，）沒有影響。但是，如果我將（ControlledException，）更改為“異?！被颉邦愋湾e誤”，則會捕獲錯誤。self.allowed_exceptions
1 回答
動漫人物
TA貢獻1815條經驗 獲得超10個贊
定義此類自定義異常時，要么必須直接使用它們，要么必須捕獲原始異常，然后引發自定義異常。raise
在這里，我捕獲了原始異常，抑制了它們的回溯并引發了自定義異常。
from functools import wraps
class ControlledException(TypeError, AttributeError):
"""A generic exception on the program's domain."""
class WithRetry:
def __init__(self, retries_limit=3, allowed_exceptions=None):
self.retries_limit = retries_limit
self.allowed_exceptions = allowed_exceptions or (ControlledException,)
def __call__(self, operation):
@wraps(operation)
def wrapped(*args, **kwargs):
for _ in range(self.retries_limit):
try:
return operation(*args, **kwargs)
# if you want to catch the error, you have to catch the original
# exceptions as opposed to custom exceptions
except (TypeError, AttributeError) as exc:
print(f"retrying {operation.__qualname__} due to {exc}")
# this suppresses the original error message and raises your
# custom exception
raise ControlledException("Here is your error message!!") from None
return wrapped
@WithRetry()
def test(x):
x = x + 1
print(x)
test("a")
這將打印出來：
retrying test due to can only concatenate str (not "int") to str
---------------------------------------------------------------------------
ControlledException Traceback (most recent call last)
<ipython-input-364-2a7d6eb73e92> in <module>
38
39
---> 40 test('a')
<ipython-input-364-2a7d6eb73e92> in wrapped(*args, **kwargs)
27 # this suppresses the original error message and raises your
28 # custom exception
---> 29 raise ControlledException('Here is your error message!!') from None
30
31 return wrapped
ControlledException: Here is your error message!!
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