tkinter：當按下按鈕時不調用函數

Question

這是我爲了展示問題而做出的一個簡單示例，它是從大型項目中提取的，所以請原諒命名。因此，基本上我有如下所示的GUI：

連接按鈕和BE \ RP ...按鈕屬於一個幀（control_container），它是像導航或標籤選擇，應始終顯示出來，並且info按鈕屬於另一個框架（容器），當你點擊BE \ RP ...按鈕時，它應該改變到那些相應的框架類，並且它會。讓我困惑的是，當點擊連接按鈕時，它應該調用函數連接並執行打印。然而，它不起作用：當你點擊它時，根本沒有發生任何事情。但我確實知道該程序會識別連接功能，因爲如果您刪除該功能，它會發出抱怨。相比之下，如果您點擊StartPage上的信息，它就可以正常工作並打印。這對我來說真的很奇怪。

import tkinter as tk 
from tkinter import ttk 
from tkinter import * 



class emcAutoApp(tk.Tk): 

    def __init__(self, *args, **kwargs): 

     tk.Tk.__init__(self, *args, **kwargs) 


     self.control_container = tk.Frame(self) 
     self.control_container.pack(side="top", fill="both", expand = True) 


     container = tk.Frame(self, width=768, height=576, bg="") 
     container.pack(side="top", fill="both", expand = True) 
     container.grid_rowconfigure(0, weight=1)  
     container.grid_columnconfigure(0, weight=1) 

     self.frames = {} 

     for F in (StartPage, BE, RP, PreScan, RSE): 
      frame = F(container, self) 
      self.frames[F] = frame 
      frame.grid(row=0, column = 0, sticky='nsew') 

     self.show_frame(StartPage) 

    def show_frame(self, cont): 

     frame = self.frames[cont] 
     frame.tkraise() 

    def get_page(self, page_class): 
     return self.frames[page_class] 


class StartPage(tk.Frame): 

    def __init__(self, parent, controller): 
     tk.Frame.__init__(self,parent) 

     self.frame_controller = controller 

     #control frame starts here 
     control_frame = ttk.Frame(self.frame_controller.control_container) 
     control_frame.pack(side='top') 

     chamber_frame = Frame(control_frame, 
          borderwidth=5, 
          relief=RIDGE, 
          width=200 
         ) 
     chamber_frame.pack(side=TOP, expand=YES, fill=X) 

     chamber_frame_1 = Frame(chamber_frame, 
          borderwidth=1, 
          relief=RIDGE, 
          width=100 
         ) 
     chamber_frame_1.pack(side=LEFT, expand=YES, fill=X) 

     chamber_frame_2 = Frame(chamber_frame, 
          borderwidth=1, 
          relief=RIDGE, 
          width=100 
         ) 
     chamber_frame_2.pack(side=LEFT, expand=YES, fill=X) 


     connect_button = ttk.Button(chamber_frame_2, text="connect", command=lambda: self.connect) 
     connect_button.pack() 

     tab_frame = Frame(control_frame, 
          borderwidth=5, 
          relief=RIDGE, 
          width=500 
         ) 
     tab_frame.pack(side=TOP, expand=YES, fill=X) 

     tab_frame_1 = Frame(tab_frame, 
          borderwidth=1, 
          relief=RIDGE, 
          width=100 
         ) 
     tab_frame_1.pack(side=LEFT, expand=YES, fill=X) 

     tab_frame_2 = Frame(tab_frame, 
          borderwidth=1, 
          relief=RIDGE, 
          width=100 
         ) 
     tab_frame_2.pack(side=LEFT, expand=YES, fill=X) 

     tab_frame_3 = Frame(tab_frame, 
          borderwidth=1, 
          relief=RIDGE, 
          width=100 
         ) 
     tab_frame_3.pack(side=LEFT, expand=YES, fill=X) 

     tab_frame_4 = Frame(tab_frame, 
          borderwidth=1, 
          relief=RIDGE, 
          width=100 
         ) 
     tab_frame_4.pack(side=LEFT, expand=YES, fill=X) 

     BE_button = ttk.Button(tab_frame_1, text="BE", 
          command=lambda: self.frame_controller.show_frame(BE)) 
     BE_button.pack() 

     RP_button = ttk.Button(tab_frame_2, text="RP", 
          command=lambda: self.frame_controller.show_frame(RP)) 
     RP_button.pack() 

     PreScan_button = ttk.Button(tab_frame_3, text="PreScan", 
          command=lambda: self.frame_controller.show_frame(PreScan)) 
     PreScan_button.pack() 

     RSE_button = ttk.Button(tab_frame_4, text="RSE", 
          command=lambda: self.frame_controller.show_frame(RSE)) 
     RSE_button.pack() 


     infobutton = ttk.Button(self, text = "info", command = self.info) 
     infobutton.pack() 


    def info(self): 
     print("info") 

    def connect(self): 
     print("connected") 

class BE(tk.Frame): 

    def __init__(self, parent, controller): 
     tk.Frame.__init__(self,parent) 


     self.frame_controller = controller 

class RP(tk.Frame): 

    def __init__(self, parent, controller): 
     tk.Frame.__init__(self,parent) 


     self.frame_controller = controller 

class PreScan(tk.Frame): 

    def __init__(self, parent, controller): 
     tk.Frame.__init__(self,parent) 


     self.frame_controller = controller 

class RSE(tk.Frame): 

    def __init__(self, parent, controller): 
     tk.Frame.__init__(self,parent) 


     self.frame_controller = controller 


if __name__ == "__main__": 

    #=== GUI ===# 
    LARGE_FONT = ("Verdana", 12) 
    NORM_FRONT = ("Verdana", 10) 

    app = emcAutoApp() 
    app.mainloop() 

Answer 1

lambda: self.connect不調用連接。在這種情況下，不需要lambda，只是直接引用該功能。作爲一般的經驗法則，按鈕應該總是直接綁定到功能上而不是使用lambda

connect_button = ttk.Button(..., command=self.connect)