except (IOError, ValueError) as e: raise RiskyOperationError("操作过程中发生错误") from e T = TypeVar("T") RiskyReturnType = Union[T, RiskyOperationError] def do_risky_thing() -> RiskyReturnType[str]: try: # ... return "Success" except Exception as e: raise RiskyOperationError("操...
message = message class TransitionError(Error): """Raised when an operation attempts a state transition that's not allowed. Attributes: previous -- state at beginning of transition next -- attempted new state message -- explanation of why the specific transition is not allowed """ def __...
TypeError: can only concatenatestr(not"int")tostr 异常以不同的类型出现,这些类型都作为信息的一部分打印出来: 例子中的类型有 ZeroDivisionError,NameError 和 TypeError。 错误信息的前面部分显示了异常发生的上下文,并以调用栈的形式显示具体信息。 异常处理 try/except 异常捕捉可以使用try/except语句。 以下例子...
raises(InvalidOperation): cursor.first() Example #8Source File: message.py From recruit with Apache License 2.0 5 votes def insert(collection_name, docs, check_keys, safe, last_error_args, continue_on_error, uuid_subtype): """Get an **insert** message. .. note:: As of PyMongo 2.6...
read_data=file.read()exceptFileNotFoundError as fnf_error:print(fnf_error)finally:print('这句话,无论异常是否发生都会执行。') 4.抛出异常 Python 使用 raise 语句抛出一个指定的异常。 raise语法格式如下: raise[Exception [, args [, traceback]]] ...
message -- explanation of the error """ def __init__(self, expression, message): self.expression = expression self.message = message class TransitionError(Error): """Raised when an operation attempts a state transition that's not allowed. ...
Python decimal.InvalidOperation用法及代码示例 用法: classdecimal.InvalidOperation 执行了无效操作。 表示请求的操作没有意义。如果没有被捕获,则返回NaN。可能的原因包括: Infinity - Infinity0* Infinity Infinity / Infinity x %0Infinity % x sqrt(-x)andx >00**0x ** (non-integer)...
(self,expression,message):self.expression=expressionself.message=messageclassTransitionError(Error):"""Raised when an operation attempts a state transition that's not allowed. Attributes: previous -- state at beginning of transition next -- attempted new state message -- explanation of why the ...
(self, expression, message):self.expression = expressionself.message = messageclass TransitionError(Error):"""Raised when an operation attempts a state transition that's notallowed.Attributes:previous -- state at beginning of transitionnext -- attempted new statemessage -- explanation of why the ...
class TransitionError(Error): """Raised when an operation attempts a state transition that's not allowed. Attributes: previous -- state at beginning of transition next -- attempted new state message -- explanation of why the specific transition is not allowed ...