Question

我需要帮助，我的简单编程是使用NameError，我的代码：

class Televisao():
    def __init__(self,boolean, channel):
        self.channel = 2
        self.boolean = False
    def main():
       tvhome =Televisao()
    print tvhome.channel

    if __name__== "__main__" :
        main()

NameError：name＆＃39; tvhome＆＃39;未定义

Answer 1

class Televisao:
    def __init__(self, is_on, channel):
        self.is_on = is_on
        self.channel = channel

def main():
   tvhome = Televisao(True, 13)
   print(tvhome.channel)

if __name__== "__main__":
    main()

Answer 2

class Televisao():
    def __init__(self,boolean, channel):
         self.channel = 2
         self.boolean = False

if __name__== "__main__" :
    tvhome = Televisao()
    print tvhome.channel

<强>更新您似乎已在函数内部创建实例并从外部调用它。

 def main():
     tvhome = Televisao() # now tvhome is local variable.

 print tvhome.channel  # you will get the error : undefined

<强>更新当您调用

时，将发生另一个错误

tvhome = Televisao() # without its __init__ parameters boolean , channel

我需要一个帮助我的简单编程与NameError

2 个答案: