How does python turn off the exception context

Editor to share with you how to turn off the abnormal context of python, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

When you handle an exception, due to improper handling or other problems, when another exception is thrown, the thrown exception will also carry the original exception information.

Read it again and you will understand it now.

Like this.

You can see two exception messages from the output:

If an exception is thrown in an exception handler or finally block, by default, the exception mechanism works implicitly to append the previous exception as the _ _ context__ attribute of the new exception.

This is the automatic association of exception contexts enabled by Python by default.

If you want to control this context yourself, you can add a from keyword (the limitation of from is that the second expression must be another exception class or instance.) To indicate which exception caused your new exception.

The output is as follows

Of course, you can also use the with_traceback () method to set the _ _ context__ property of the exception, which can also better display the exception information in backtracking.

Finally, do you want to completely turn off this mechanism for automatically associating exception contexts? What else can we do?

Can be used to raise... Never, from the following example, there is no original exception

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