TypeError-Python中的类

问题描述

我是Python的初学者，刚开始接触类.我敢肯定这可能是非常基本的东西，但是为什么要这样写代码:

I'm a beginner at Python just getting to grips with classes. I'm sure it's probably something very basic, but why does this code:

class Television():
    def __init__(self):
        print('Welcome your TV.')
        self.volume = 10
        self.channel = 1
    def channel(self, channel):
        self.channel = input('Pick a channel: ')
        print('You are on channel ' + self.channel)
    def volume_up(self, amount):
        self.amount = ('Increase the volume by: ')
        self.volume += self.amount
        print('The volume is now ' + self.volume)
    def volume_down(self, amount):
        self.amount = ('Decrease the volume by: ')
        self.volume -= self.amount
        print('The volume is now ' + self.volume)
myTele = Television()
myTele.channel()
myTele.volume_up()
myTele.volume_down()

产生以下错误:

TypeError: 'int' object is not callable, Line 18

编辑:我将代码更改为此:

EDIT: I changed the code to this:

class Television():
    def __init__(self, volume = 10, channel = 1):
        print('Welcome your TV.')
        self.volume = volume
        self.channel = channel
    def change(self, channel):
        self.channel = input('Pick a channel: ')
        print('You are on channel ' + self.channel)
    def volume_up(self, amount):
        self.amount = int(input('Increase the volume by: '))
        self.volume += self.amount
        print('The volume is now ' + str(self.volume))
    def volume_down(self, amount):
        self.amount = int(input('Decrease the volume by: '))
        self.volume -= self.amount
        print('The volume is now ' + str(self.volume))
myTele = Television()
myTele.change()
myTele.volume_up()
myTele.volume_down()

但是它返回:

TypeError: change() missing 1 required positional argument: 'channel'

同样，这是从刚开始上课的人那里来的，所以如果我做了明显明显的错误，请不要太苛刻.谢谢.

Again, this is coming from someone just starting with classes, so please don't be too harsh if I've done something glaringly obvious wrong. Thank you.

推荐答案

您在 __ init __ 中分配一个 channel 属性:

self.channel = 1

这遮盖了类上的 channel()方法.重命名属性或方法.

This shadows the channel() method on the class. Rename the attribute or the method.

属性胜过类上的属性(数据描述符除外；请考虑 property s).从类定义文档:

Attributes on the instance trump those on the class (except for data descriptors; think propertys). From the Class definitions documentation:

您的方法还期望您在示例中未传递的参数，但我认为您接下来将自己解决该问题.

Your methods also expect a parameter that you are not passing in in your example, but I'm figuring you'll solve that yourself next.

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