英文:
Python: How to resolve TypeError issue from Try Except function?
问题
我是一个Python新手，我想了解如何在我的Try和Except函数中避免出现TypeError错误，当除数为零时。
给定：
a = 0 # 通常情况下我有一个大于等于1的数字，但我可能会得到0作为输入
b = 0 # 通常情况下我有一个大于等于1的数字，但我可能会得到0作为输入
这是代码：
try:
h = a / b
except ZeroDivisionError:
h = 0
这是错误消息：
TypeError: catching classes that do not inherit from BaseException is not allowed
英文:
I'm a python newbie and I'd like to understand how I can avoid getting TypeError error from my Try and Except function with zeros.
Given:
a= 0 (usually I have a number (>=1), but I could get 0 as an input)
b= 0 (usually I have a number (>=1), but I could get 0 as an input)
Here is the code:
try:
h = a/b
except ZeroDivisionError:
h = 0
Here is the error message:
TypeError: catching classes that do not inherit from BaseException is not allowed
答案1
得分: 1
错误提示您的自定义异常 ZeroDivisionError 必须继承自 BaseException 类。
class MyZeroDivisionError(Exception):
pass
话虽如此，此错误随基本 Python 一起提供。实际上，您的片段对我来说可以正常工作，我无法重现 TypeError。您是否可以分享一个可重现的示例或您的其余代码？
英文:
The error is telling you that your custom exception ZeroDivisionError must inherit from the BaseException class.
class MyZeroDivisionError(Exception):
pass
That said, this error ships with base Python. In fact, your snippet works for me, and I am unable to reproduce the TypeError. Can you either share a reproducible example, or the rest of your code?
答案2
得分: 0
可能你创建了一个名为 class ZeroDivisionError 的类，但它没有继承自 Exception，因此出现了错误。
在使用内置异常的情况下（文档链接：点击这里），最好直接使用内置异常。
>>> try:
... 5/0
... except ZeroDivisionError:
... print("不能除以零！")
...
不能除以零！
编辑：如果要创建一个可以被你的程序捕获的自定义类，可以这样做：
>>> class MyException(Exception):
... pass
...
>>> try:
... raise MyException("我的错误消息")
... except MyException as e:
... print(e)
...
我的错误消息
英文:
Probably you created a class ZeroDivisionError that does not inherit from Exception, thus the error.
In case of a built in exception (docs: click me), it's better that you just use that.
>>> try:
... 5/0
... except ZeroDivisionError:
... print("Cannot divide by zero!")
...
Cannot divide by zero!
EDIT: to create a custom class that can be caught by your program you can do something like:
>>> class MyException(Exception):
... pass
...
>>> try:
... raise MyException("My error message")
... except MyException as e:
... print(e)
...
My error message
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