使用Python GUI創建按鈕

Question

我正在嘗試使用類在Python中創建Buttons，但是在運行它時按鈕不會出現。 以下是我的代碼

#Button_2
#Using Classes

from Tkinter import * 

class Application(Frame):
    """A GUI application with three button"""

    def _init_(self, master):
        """ Initialise the Frame. """
        Frame._init_(self, master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        #"""Create three buttons"""
        #Create first buttom
        self.btn1 = Button(self, text = "I do nothing")
        self.btn1.grid()

        #Create second button
        self.btn2 = Button(self)
        self.btn2.grid()
        self.btn2.configure(text = "T do nothing as well")

        #Create third button
        self.btn3 = Button(self)
        self.btn3.grid()    
        self.btn3.configure(text = "I do nothing as well as well")

    root = Tk()
    root.title("Lazy Button 2")
    root.geometry("500x500")
    app = Application(root)

    root.mainloop()

任何幫助，將不勝感激

Answer 1

您需要將“構造函數”方法命名為__init__ ，而不是_init_ 。 在編寫時，因為從未調用_init_永遠不會調用grid和create_widgets方法。

Answer 2

好的，第一個問題是您已經聲明了以下代碼：

root = Tk()
root.title("Lazy Button 2")
root.geometry("500x500")
app = Application(root)

root.mainloop()code here

在班級本身。 它應該在外面，所以這是一個縮進問題（也許是縮進的stackoverflow問題？）。

其次，我簡化了代碼以使其運行

from Tkinter import * 

class Application(Frame):
      """A GUI application with three button"""

     #create a class variable from the root (master):called by the constructor
     def _init_(self, master):
          self.master = master

     #simple button construction
     # create a button with chosen arguments
     # pack it after the creation not in the middle or before

     def create_widgets(self):
          #"""Create three buttons"""
          #Create first button
          btn1 = Button(self.master, text = "I do nothing")
          btn1.pack()

          #Create second button
          btn2 = Button(self.master, text = "T do nothing as well")
          btn2.pack()

         #Create third button
         btn3=Button(self.master, text = "I do nothing as well as well")
         btn3.pack()

  #must be outside class definition but probably due to stackoverlow
  root = Tk()
  root.title("Lazy Button 2")
  root.geometry("500x500")
  app = Application(root)
  #call the method
  app.create_widgets()
  root.mainloop()

這是一個起點，並且肯定可以通過以下方式工作：

您可以使用grid（）而不是pack來解決問題，並從def init構造函數中調用該方法。 希望能幫助到你。

此調用方法也適用：

root = Tk()
root.title("Lazy Button 2")
root.geometry("500x500")
app = Application(root).create_widgets()  #creates and invokes
root.mainloop()

我的最終嘗試也有效：

def __init__(self,master):
    self.master = master
    self.create_widgets()

其次是：

root = Tk()
root.title("Lazy Button 2")
root.geometry("500x500")
app = Application(root)
root.mainloop()

最終代碼：

from Tkinter import * 

class Application(Frame):
"""A GUI application with three button"""

def __init__(self,master):
    self.master = master
    self.create_widgets()



def create_widgets(self):
    #"""Create three buttons"""
    #Create first buttom
    btn1 = Button(self.master, text = "I do nothing")
    btn1.pack()

    #Create second button
    btn2 = Button(self.master, text = "T do nothing as well")
    btn2.pack()

    #Create third button
    btn3=Button(self.master, text = "I do nothing as well as well")
    btn3.pack()

root = Tk()
root.title("Lazy Button 2")
root.geometry("500x500")
app = Application(root)
root.mainloop()