Serhiy Storchaka added the comment:

The default case is added just for silencing compiler warning. It is never 
executed. There are a number of places in the core that look like

    assert(0);
    return NULL; /* or whatever */

This is a dead code, but compilers complain without it.

How do you suggest to improve this code?

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue31337>
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