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Z	dS)a1Word completion for GNU readline.

The completer completes keywords, built-ins and globals in a selectable
namespace (which defaults to __main__); when completing NAME.NAME..., it
evaluates (!) the expression up to the last dot and completes its attributes.

It's very cool to do "import sys" type "sys.", hit the completion key (twice),
and see the list of names defined by the sys module!

Tip: to use the tab key as the completion key, call

    readline.parse_and_bind("tab: complete")

Notes:

- Exceptions raised by the completer function are *ignored* (and generally cause
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- The evaluation of the NAME.NAME... form may cause arbitrary application
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  feature, I consider this an acceptable risk.  More complicated expressions
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- When the original stdin is not a tty device, GNU readline is never
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