Python Cookbook (3rd edition) Chinese version: 14.10 re-throw caught exception

14.10 re-throw the caught exception?

You caught an except exception in a block and now want to re-throw it.

Solution?

Simply use a single rasie statement, for example:

>>>DefExample():...Try:...int ( ' n/a ' )  ... except valueerror: ... print ( "didn ' t work" )  ... raise ... >>> example () didn ' t work traceback (most recent call last): File  "<stdin>", line 1, in span class= "n" ><module> File  "<stdin>", line 3, in  Examplevalueerror: invalid literal for int. () with base: ' N/a ' > >>               

Discuss?

The problem is usually when you need to perform an action (such as logging, cleanup, etc.) after catching an exception, but then you want to propagate the exception.
A very common usage is in the processor that captures all exceptions:

Try: ...    eraise   

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Python Cookbook (3rd edition) Chinese version: 14.10 re-throw caught exception