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Today, the editor will share with you the relevant knowledge points about how to use the python exception chain. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Description

1. When an exception An is caught through except, you can use the raise statement to throw an exception B again.

Then the abnormal information we see is the information of B. But we don't know where the exception B comes from, so at this point, we can use the exception chain.

2. Use the raisefrom statement when throwing an exception chain.

Example

> def func (): Raise IOError... > > try:... Func (). Except IOError as exc:... Raise RuntimeError ('Failed to open database') from exc...Traceback (most recent call last): File ", line 2, in File", line 2, in funcOSError The above exception was the direct cause of the following exception: Traceback (most recent call last): File ", line 4, in RuntimeError: Failed to open database are all the contents of this article" how to use python exception chains ". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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