def set_grammar(self, grammar):
        if grammar is self._grammar: return
        self._grammar = grammar
        self._restart = True
Return a list of matching units names.
dataset/ETHPy150Open nltk/nltk/nltk/parse/chart.py/SteppingChartParser.set_grammar--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/physics/units.py/find_unit