Xiang Zhang added the comment:

It's cool, but I get one problem when writing tests. support.captured_stderr 
cannot capture the runtime error message. So we have nothing to do with the 
assertion and the test will always succeed even when overflow does happen (the 
message will be output). To solve this problem, we have to do io redirect in 
file descriptor level, I wonder does this deserve that?

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<http://bugs.python.org/issue1621>
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