nltk.SteppingShiftReduceParser.step¶

SteppingShiftReduceParser.step()[source]¶

Perform a single parsing operation. If a reduction is possible, then perform that reduction, and return the production that it is based on. Otherwise, if a shift is possible, then perform it, and return True. Otherwise, return False.

Returns:	False if no operation was performed; True if a shift was performed; and the CFG production used to reduce if a reduction was performed.
Return type:	Production or bool