15.8.1 Completer Objects
Completer objects have the following method:
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Return the stateth completion for text.
If called for text that doesn't include a period character ("."), it will complete from names currently defined in __main__, __builtin__ and keywords (as defined by the keyword module).
If called for a dotted name, it will try to evaluate anything without obvious side-effects (functions will not be evaluated, but it can generate calls to __getattr__()) up to the last part, and find matches for the rest via the dir() function.
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