[issue26351] Occasionally check for Ctrl-C in long-running operations like sum

[George Slavin]

George Slavin added the comment:

I've attached the test for this patch (I couldn't figure out how to upload two files with one comment).

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Added file: http://bugs.python.org/file44747/test_sig_int_builtins.py

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<http://bugs.python.org/issue26351>
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