encapsulation.py (Source)

class Computer:
    def __init__(self):
        self.__maxprice = 800
    def sell(self):
        print("Selling Price: {}".format(self.__maxprice))
    def setMaxPrice(self, price):
        self.__maxprice = price
c = Computer()
c.sell()
# change the price
c._Computer__maxprice = 1000
c.sell()
# using setter function
c.setMaxPrice(2500)
c.sell()