pyparsing.py 文件源码

def get(self, key, defaultValue=None):
        """
        Returns named result matching the given key, or if there is no
        such name, then returns the given C{defaultValue} or C{None} if no
        C{defaultValue} is specified.

        Similar to C{dict.get()}.

        Example::
            integer = Word(nums)
            date_str = integer("year") + '/' + integer("month") + '/' + integer("day")           

            result = date_str.parseString("1999/12/31")
            print(result.get("year")) # -> '1999'
            print(result.get("hour", "not specified")) # -> 'not specified'
            print(result.get("hour")) # -> None
        """
        if key in self:
            return self[key]
        else:
            return defaultValue