尽管现代异步编程推荐使用async def和await,但在旧版本Python或某些特定场景中 ,yield仍可用于实现协程。例如,使用@types.coroutine装饰器将含有yield的生成器标记为协程,并通过yield from与异步操作交互。 from types import coroutine import asyncio @coroutine def old_style_coroutine(): response = yield from async...
return decorator @retry_on_specific_errors(retries=3, error_types=(ConnectionError,)) def fetch_remote_data(url): # 这里假设了fetch_data函数会抛出ConnectionError raise ConnectionError("Failed to connect.") try: fetch_remote_data("http://example.com/data") except Exception as e: print(f"Fai...
Whenever these types of runtime errors occur, Python creates an exception object. If not handled properly, it prints a traceback to that error along with some details about why that error occurred. Let's look at how Python treats these errors: divide_numbers = 7 / 0 print(divide_numbers)...
raise TypeError('bad input') from E 1. 2. 3. 4. 执行的结果如下: Traceback (most recent call last): File "hh.py", line 2, in <module> 1/0 ZeroDivisionError: division by zero The above exception was the direct cause of the following exception: Traceback (most recent call last): ...
| ZeroDivisionError|Division (ormodulus) by zeroerror(allnumeric types)| | AssertionError|Failureofassertstatement| | AttributeError|No such objectattribute| | EOFError|End-of-filemarker reached without input from built-in| | EnvironmentError|Base classforoperating system environment errors| ...
通过创建一个新的异常类拥有自己的异常,自定义的异常类必须是Exception或者Error的子类! #!/usr/bin/env python#encoding: utf-8classIllegalException(Exception):'''Custom exception types'''def__init__(self, parameter, para_value): err='The parameter "{0}" is not legal:{1}'.format(parameter, ...
types模块可以动态创建异常类。这对于基于运行时条件动态生成自定义异常非常有用。 import types DynamicException = types.new_class('DynamicException', (Exception,)) raise DynamicException("A dynamically created exception") 16、访问所有内置异常 builtins可以列出Python中可用的所有内置异常,帮助我们了解层次结构和...
Error: Unsupported types. Please provide numbers. 代码分析 除法函数:divide 函数接受两个参数并尝试进行除法操作。 捕获异常: 如果第二个参数为零,抛出 ZeroDivisionError,并输出相应的错误信息。 如果其中一个参数不是数字,抛出 TypeError,并输出类型错误信息。 使用通用的 except Exception as e 捕获其他未预见的...
import os, socket, errno, types, tempfile # create our a new NetworkError exception, derived from IOError class NetworkError(IOError): pass # create our a new FileError exception, derived from IOError class FileError(IOError): pass
https://docs.python.org/3/library/exceptions.html#exception-hierarchy 调试错误: 断言:assert 功能:当满足条件时,抛出错误 (类似 if 和 raise 的结合体) 特点: 相比if...raise,断言assert可以通过python解释器关闭,使其失效 (这时assert就等价于pass语句了) ...