property_demo.py

def get_field(self):
    return self.__data

def set_field(self, val):
    self.__data = val


def Field():
    return property(get_field, set_field)


class A(object):
    name = Field()


a = A()
b = A()
a.name = 1
b.name = 2
print(a.name) # 1
print(b.name) # 2