1.Python语言中比较特殊的是，可以动态为类和对象增加成员。下面的案例是为Car类动态增加属性name和成员方法setSpeed()还有访问属性。
[sourcecode language=”python” title=”demo11.py”]
import types
class Car:
price = 10000
def __init__(self, c):
self.color = c
#主程序
car1 = Car("Red")
car2 = Car("Blue")
print(car1.color, Car.price)
Car.price = 110000
Car.name = ‘QQ’
car1.color = "Yellow"
print(car2.color, Car.price, Car.name)
print(car1.color, Car.price, Car.name)
def setSpeed(self, s):
self.speed = s
car1.setSpeed = types.MethodType(setSpeed, Car)
car1.setSpeed(50)
print(car1.speed)
#如果存在color属性就返回True
print(hasattr(car1, ‘color’))
#返回color属性的值
print(getattr(car1, ‘color’))
#添加color属性的值为8
setattr(car1, ‘color’, 8)
print(car1.color)
#删除color属性
delattr(car1, ‘color’)
[/sourcecode]
运行结果：

2.类属性的调用。
[sourcecode language=”python” title=”demo12.py”]
class Employee:
‘所有员工的基类’
empCount = 0
def __init__(self, name, salary):
self.name = name
self.salary = salary
Employee.empCount += 1
def displayCount(self):
print("Total Employee %d" % Employee.empCount)
def displayEmployee(self):
print("Name:", self.name, ",Salary", self.salary)
#类的文档字符串
print("Employee.__doc__:", Employee.__doc__)
#类命
print("Employee.__name__:",Employee.__name__)
#类定义所在的模块
print("Employee.__module__:",Employee.__module__)
#类的所有父类组成的元祖
print("Employee.__bases__:",Employee.__bases__)
employee1 = Employee("benzhu",2)
employee1.displayCount()
employee1.displayEmployee()
employee2 = Employee("shazhu",3)
employee1.displayCount()
employee1.displayEmployee()
[/sourcecode]
运行结果：