小编Jam*_*Jam的帖子

我需要制作一个向用户显示频道和音量的电视,并显示电视是否打开.我有大部分代码,但由于某种原因,频道不会切换.我对属性的工作方式还不太熟悉,我认为这就是我的问题所在.请帮忙.

class Television(object):

    def __init__(self, __channel=1, volume=1, is_on=0):
        self.__channel=__channel
        self.volume=volume
        self.is_on=is_on

    def __str__(self):
        if self.is_on==1:
            print "The tv is on"
            print self.__channel
            print self.volume
        else:
            print "The television is off."

    def toggle_power(self):
        if self.is_on==1:
            self.is_on=0
            return self.is_on
        if self.is_on==0:
            self.is_on=1
            return self.is_on

    def get_channel(self):
        return channel

    def set_channel(self, choice):
        if self.is_on==1:
            if choice>=0 and choice<=499:
                channel=self.__channel
            else:
                print "Invalid channel!"
        else:
            print "The television isn't on!"

    channel=property(get_channel, set_channel)

    def raise_volume(self, up=1):
        if self.is_on==1:
            self.volume+=up
            if self.volume>=10:
                self.volume=10
                print "Max volume!" …

我正在制作一个你正在发射"爆炸"的程序,我有5个弹药.我正在爆炸一个有5个健康的外星人.最后,我实例化播放器并让他爆炸6次以检查程序是否正常工作.但是我这样做的方式使得数量不会减少.有没有一个简单的解决方案,或者我只需要为弹药和健康创建一个新的属性？这就是我所拥有的:

class Player(object):
""" A player in a shooter game. """
def blast(self, enemy, ammo=5):
    if ammo>=1:
        ammo-=1
        print "You have blasted the alien."
        print "You have", ammo, "ammunition left."
        enemy.die(5)
    else:
        print "You are out of ammunition!"


class Alien(object):
    """ An alien in a shooter game. """
    def die(self, health=5):
        if health>=1:
            health-=1
            print "The alien is wounded. He now has", health, "health left."
        elif health==0:
            health-=1
            print "The alien gasps and says, 'Oh, this is it.  This is …