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It's very cool to do "import sys" type "sys.", hit the completion key (twice),
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Tip: to use the tab key as the completion key, call

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Notes:

- Exceptions raised by the completer function are *ignored* (and generally cause
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- GNU readline is also used by the built-in functions input() and
raw_input(), and thus these also benefit/suffer from the completer
features.  Clearly an interactive application can benefit by
specifying its own completer function and using raw_input() for all
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