attributeerror python_python练习类的时候遇到了AttributeError？

# coding:utf-8

CHANNEL = ["1", "2", "3", "4", "5", "6",

"7", "8", "9", "10", "11", "12"]

class Television(object):

"""模拟电视机"""

def __init__(self, channel=1, volume=0):

self.channel = channel

self.volume = volume

@property

def change_volume(self):

"""调音量"""

volume = None

while not volume:

volume = raw_input("请输入音量(0~100)：")

try:

volume = int(volume)

except:

print "请输入正确的音量"

volume = None

if (volume > 100) or (volume < 0):

print "输入音量范围有误，请重新输入"

volume = None

elif volume == 0:

print "你现在是静音状态"

else:

print "目前电视的音量是", volume

self.volume = volume

@property

def change_channel(self):

"""调频道"""

channel = None

while not channel:

channel = raw_input("请输入频道(1~12)：")

try:

channel = int(channel)

except:

print "请输入正确的频道"

channel = None

self.channel = channel

print "目前电视频道是channel"+ str(channel),

print "它是"+CHANNEL[channel]

def main():

television = Television()

choice = None

while choice != "0":

"""模拟电视

0 - 关机

1 - 换台

2 - 调音量

"""

choice = raw_input("""请输入选项：""")

if choice == "0":

print "再见"

elif choice == "1":

television.change_channel

elif choice == "2":

television.change_volume

else:

print "请输入正确的选项"

if __name__ == '__main__':

main()

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attributeerror python_python练习类的时候遇到了AttributeError？

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