[Python]类,函数和属性

#!/usr/local/bin/python3
#coding=UTF-8
'''''
Created on 2011-2-25
@author: Jacky
'''
class Counter:
    #类属性
    count = 0
    #类属性
    age = 0
    def __init__(self):
        #Counter.count += 1
        self.__class__.count +=1

#python的查找顺序:obj.__dict__ --> obj__class__.__dict__
#obj.__dict__ 中存储实例属性和实例方法 obj__class__.__dict__中存储类属性和类方法
#如果在 obj.__dict__ 中找到就采用 obj.__dict__中对应的值,如果没有找到就在 obj.__class__.__dict__中查找
counter = Counter()
#counter.age = 0
print("counter age:",counter.age);
#Counter.age = 0
print("Counter age:",Counter.age);
#从obj.__dict__中查找 age 属性 age=None
print("counter dict age:",counter.__dict__.get("age"))
#从obj.__class__.__dict__中查找 age 属性 age = 0
print("Counter dict age:",counter.__class__.__dict__.get("age"))
print()

#给counter添加age属性并赋值为10
counter.age = 10
print("counter.age = 10")
#counter.age = 10
print("counter.age:",counter.age)
#Counter.age = 10
print("Counter.age:",Counter.age)
#从obj.__dict__中查找 age 属性 age = 10

print("counter dict age:",counter.__dict__.get("age"))
#从obj.__class__.__dict__中查找 age 属性 age = 0
print("Counter dict age:",counter.__class__.__dict__.get("age"))
print()

#删除counter的age属性
del counter.age
print("del counter.age")
#counter.countage = 0
print("counter.age:",counter.age)
#Counter.age = 0
print("counter.age:",Counter.age)
#从obj.__dict__中查找 age 属性 age = None

print("counter dict age:",counter.__dict__.get("age"))
#从obj.__class__.__dict__中查找 age 属性 age = 0
print("Counter dict age:",counter.__class__.__dict__.get("age"))
print()

#给counter动态添加name属性
counter.name = "zhang"
#给counter动态添加age属性
counter.age = 12
print("counter age:",counter.age)
print("counter name:",counter.name)

counter1 = Counter()
print("counter1 count:",counter1.count)
print("counter1 dict:", counter1.__dict__.get("count"))
print("Counter  count:",Counter.count)
#print("Counter  dict:", Counter.__dict__.get("count"))
print("Counter  dict:", counter1.__class__.__dict__.get("count"))
print()
counter2 = Counter()
print("counter2 count:",counter2.count)
print("counter2 dict:", counter2.__dict__.get("count"))
print("Counter  count:",Counter.count)
#print("Counter  dict:", Counter.__dict__.get("count"))
print("Counter  dict:", counter2.__class__.__dict__.get("count"))