STINNER Victor <victor.stin...@gmail.com> added the comment:

> The signal(SIGWINCH, SIG_IGN) call doesn't return the old, working signal 
> handler; it returns 0

See bpo-13285: "signal module ignores external signal changes".

By the way, I recently modified test_curses to save/restore signal handlers: 
see bpo-31629.

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<https://bugs.python.org/issue3949>
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