定义类

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def __str__(self):
        return "{} and {}".format(self.x, self.y)
    def show(self):
        print(self.x, self.y)

dict

>>> p = Point(4, 5)
>>> print(p)
4 and 5
>>> print(p.__dict__)
{'x': 4, 'y': 5}
>>> p.__dict__['y'] = 16
>>> print(p.__dict__)
{'x': 4, 'y': 16}