[Python-Dev] PEP 409 and the stdlib

Ethan Furman ethan at stoneleaf.us
Mon May 20 15:12:41 CEST 2013

As a quick reminder, PEP 409 allows this:

     except AnError:
         raise SomeOtherError from None

so that if the exception is not caught, we get the traditional single exception traceback, instead of the new:

     During handling of the above exception, another exception occurred

My question:

How do we go about putting this in the stdlib?  Is this one of the occasions where we don't do it unless we're modifying 
a module already for some other reason?

For that matter, should we?

Pros:  Makes tracebacks much less confusing, especially coming from a library

Cons:  Could hide bugs unrelated to what is being caught and transformed


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