python怎么调用方法

def fun_name(self,...);

      Pass

wash.py

class Washer:

    def __init__(self):

        self.water = 0

        self.scour = 0

    def add_water(self,water):

        print('Add water:',water)

        self.water = water

    def add_scour(self,scour):

        self.scour = scour

        print('Add scour:',self.scour)

    def start_wash(self):

        print('Start wash...')

if __name__ == '__main__':

    w = Washer()

    w.add_water(10)

    w.add_scour(2)

    w.start_wash()