嘗試學習Python，NameError：全局名稱 '控制器' 沒有定義

Question

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Exception in Tkinter callback Traceback (most recent call last): File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1536, in call return self.func(*args) File "tk_cp_successful.py", line 143, in command=lambda: controller.show_frame(StartPage))

我的錯誤是

NameError: global name 'controller' is not defined

class LoginPage(tk.Frame): 
    def __init__(self, parent, controller): 
     global entry_1 
     global entry_2 
     tk.Frame.__init__(self, parent) 
     label = tk.Label(self, text="test page") 
     label.pack(pady=20,padx=20) 

     label_1 = Label(self, text="Username") 
     label_1.pack() 
     label_2 = Label(self, text="Password") 
     label_2.pack() 
     entry_1 = Entry(self) 
     entry_1.pack() 
     entry_2 = Entry(self, show="*") 
     entry_2.pack() 
     label_1.grid(row=0, sticky=E) 
     label_1.pack() 
     label_2.grid(row=1, sticky=E) 
     label_2.pack() 
     entry_1.grid(row=0, column=1) 
     entry_1.pack() 
     entry_2.grid(row=1, column=1) 
     entry_2.pack() 
     checkbox = Checkbutton(self, text="Keep me logged in") 

     checkbox.grid(columnspan=2) 
     checkbox.pack() 
     logbtn = Button(self, text="Login", command = self.tested) 
     logbtn.grid(columnspan=2) 
     logbtn.pack() 


    def tested(self): 
     #print("Clicked") 
     username = entry_1.get() 
     password = entry_2.get() 

     #print(username, password) 

     if username == "test" and password == "test": 
      #box.showinfo("Login successful", "Welcome test") 
      button1 = ttk.Button(self, text="Back to new page", command=lambda: controller.show_frame(newPage)) 
      button1.pack() 
     else: 
      box.showerror("Login failed", "Incorrect username") 

Answer 1

您需要將控制器保存到一個成員變量/領域。

class LoginPage(tk.Frame): 
    def __init__(self, parent, controller): 
     self.controller = controller 
     # other code 

    def tested(self): 
     # other code 
     # access with self.controller