TypeError: 'NoneType' 对象不能用 tkinter 调用 [英] TypeError: 'NoneType' object is not callable with tkinter

问题描述

我正在尝试制作一个可以在按下按钮时播放声音的程序.但是我在调​​用函数时遇到了麻烦.我想要做的是单击 LowC(或任何其他音符)按钮，它会转到 LowC(或其各自的音符功能)，然后转到功能 Launch 以启动声音.相反，它给了我Nonetype"错误.我不知道出了什么问题.我试过用这个替换 this.Launch() .启动，但是它没有执行启动功能，就像我尝试过的 this.Launch(this) 一样，但是它仍然不起作用.有什么帮助吗?

I am trying to make a program that will play sounds on a button press. But i am having a trouble calling a function. What I want to do is click on the LowC (or any other note) button and it goes to the LowC (or its respective note function) and then goes to the function Launch to initiate the sound. Instead, it gives me the 'Nonetype' error. I do not know what is wrong. I've tried replacing this.Launch() with this. Launch, but then it doesn't execute the Launch function as well as I have tried this.Launch(this), but then it still doesn't work. Any help?

from tkinter import *
import winsound
import msvcrt as m

class Application(Frame):
    def __init__(this, master):
        Frame.__init__(this, master)
        this.grid()
        this.create()


    def create(this):
        test = m.kbhit()
        if test == True:
            print('test is true')
        this.sound1 = IntVar()
        this.dir = Label(this, text = "Click a button to play a sound")
        this.dir.grid(row = 1, column = 0, columnspan = 5, sticky = W)

        #Create buttons for Notes
        this.LowC = Button(this,
                           text = "Low C",
                           command = this.LowC,
                           ).grid()
        this.D = Button(this,
                           text = "D",
                           command = this.D,
                           ).grid()
        this.E = Button(this,
                           text = "E",
                           command = this.E,
                           ).grid()
        this.F = Button(this,
                           text = "F",
                           command = this.F,
                           ).grid()
        this.G = Button(this,
                           text = "G",
                           command = this.G,
                           ).grid()

        #create launch button
        this.Launch = Button(this,
                           text = "Launch",
                           command = this.Launch,
                           ).grid()

        #create sound length slider
        this.TIME = Scale(this,
                          orient = HORIZONTAL,
                          length = 400,
                          width = 20,
                          sliderlength = 10,
                          from_=0,
                          to = 5000,
                          tickinterval = 500,
                          variable = this.sound1 
                          ).grid()
        #Keypress



    #create freq conversion
    def LowC(this):
        this.freq = 262
        print(this.freq)
        this.Launch()


    def D(this):
        this.freq = 294
        print(this.freq)

    def E(this):
        this.freq = 330
        print(this.freq)

    def F(this):
        this.freq = 349
        print(this.freq)

    def G(this):
        this.freq = 392
        print(this.freq)

    #initiate beep
    def Launch(this):
        winsound.Beep(this.freq, this.sound1.get())
        print('Tada!')
        return


base = Tk()
base.title("Basic Program Outline")
base.geometry("500x500")

app = Application(base)

base.mainloop()

推荐答案

您同时拥有一个名为 LowC 的属性和方法.

You have both an attribute and a method named LowC.

this.LowC = Button(this,
                   text = "Low C",
                   command = this.LowC,
                   ).grid()
...

#create freq conversion
def LowC(this):
    this.freq = 262
    print(this.freq)
    this.Launch()

您应该重命名其中之一.

You should rename one of them.

顺便说一下，如果你做 self.some_name = Button(args).grid()，那么 self.some_name 将是 None>，因为您将 grid 的结果分配给变量，而不是您想要的 Button 实例.

By the way, if you do self.some_name = Button(args).grid(), then self.some_name will be None, because you're assigning the result of grid to the variable, not the Button instance that you want.

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