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From: drekin@gmail.com
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Subject: RE: Altering sys.stdin
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Xref: csiph.com comp.lang.python:39670

> If you're going to replace something, the replacement needs to at least
quack like the original...

That's for the freezing, even though an exception would be better. But still, even when custon TextIO object is provided, interactive console doesn't read from it (however input() does).