Python 3 Tkinter - 如何从另一个类调用函数 [英] Python 3 Tkinter - How to call a function from another class

问题描述

我试图让我的保存按钮从另一个类调用函数.我想尽可能多地点击保存按钮，它应该每次都打印你好人".不过，我无法让保存按钮起作用.

I am trying to get my save button to call a function from another class. I would like to click on the save button as much as I want and it should print "hello people" every time. Though, I am having trouble in getting the save button to work.

import tkinter as tk
from tkinter import filedialog


class Application(tk.Frame): 
    def __init__(self, parent):
        tk.Frame.__init__(self, parent) 
        self.parent = parent
        self.pack() 
        self.createWidgets()

    def createWidgets(self):

        #save button
        self.saveLabel = tk.Label(self.parent, text="Save File", padx=10, pady=10)
        self.saveLabel.pack()
        #When I click the button save, I would like it to call the test function in the documentMaker class
        self.saveButton = tk.Button(self.parent, text = "Save", command = documentMaker.test(self))
        self.saveButton.pack()


class documentMaker():
    def test(self):

      print ("hello people")  

root = tk.Tk()
app = Application(root) 
app.master.title('Sample application')
object = documentMaker()
object.test()

app.mainloop()

推荐答案

在您的 documentMaker 类中，将 test 方法更改为 @staticmethod:

In your documentMaker class, change the test method to a @staticmethod:

class documentMaker():
    @staticmethod
    def test(cls):   
      print ("hello people") 

那么你的 saveButton 的命令可以是:

Then your saveButton's command can be:

command = documentMaker.test

staticmethod 绑定到类，而不是像实例方法那样绑定到类的实例.因此，我们可以直接从类的名称中调用它.如果您不希望它成为 staticmethod，您可以将其保留为实例方法，并将命令行更改为:

A staticmethod is bound to the class, not to an instance of the class like an instance method. So, we can call it from the class's name directly. If you did not want it to be a staticmethod, you could keep it an instance method and have the command line change to:

command = documentMaker().test

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