def __split(cls, expression):
        "Private class method: help with split."
        for symbol in cls.__operators:
            if symbol in expression:
                right = expression.rsplit(symbol, 1)[1]
                tail = cls.__split(right)
                if tail is None:
                    return symbol, right
                return tail
Private class method: help with split.
recipes/Python/577469_Evaluator_20/recipe-577469.py