python类的__init__方法和__del__方法
本帖最后由 fibbery 于 2012-04-26 09:46:07 编辑

class Person():
    population=0
    def __init__(self,name):
        self.name=name
        #print 'my name\' is %s' % self.name
        Person.population+=1
    def sayHi(self):
        print 'hello everyone,my name\' is %s'% self.name
    def howMany(self):
        if Person.population==1:
            print "I am the only one here"
        else:
            print "we have %d people here" % Person.population
    def __del__(self): 
        print '%s say bye,' % self.name
        Person.population-=1
        if Person.population==0:
            print 'I am the last one here'
        else:
            print 'we still have %d people here' % Person.population
john=Person('john')
john.sayHi()
john.howMany()     

smith=Person('smith')
smith.sayHi()
smith.howMany()

打印结果：
hello everyone,my name' is john
I am the only one here
hello everyone,my name' is smith
we have 2 people here
smith say bye,
we still have 1 people here
john say bye,
[解决办法]
刚注册完就让我看到了,哈哈
_del__()的调用是在对象销亡时执行(即彻底不再使用时),但执行时间不能确定.所以,你可以在原来代码最后加上两行,del john和del smith来删除对象,使其立即调用__del__.我当初也和你一样,就因为这个

执行时间不确定,折磨了我一个晚上.