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我有一个带有 GUI（Tkinter）的程序，我想在其中添加一个登录系统。我在一个单独的库中编写了一个包含多个功能的登录窗口Login_v1。该程序和登录系统运行良好。但是，似乎某个进程在后台运行导致计算机冻结（程序本身除外），而当我分别运行程序或登录库时，它确实运行顺利，而没有在后面运行进程。我认为这与在一个程序中使用两个窗口并从一个窗口到另一个窗口有关，但我不知道如何解决它。

启动主程序它检查是否应该启动登录窗口。启动登录窗口时，它start_application通过 as 命令传递函数以在成功登录的情况下执行。start_application登录窗口将用户名和帐户类型传递给主程序功能。

在这里可以找到主程序代码的相关部分：

import tkinter as tk #GUI Library
import os #For file and directory handling
import Login_v1 as login #Login library


def start_application(Username, User_type):
    
    global mainWindow
    global FirstFrame
    global SecondFrame
    global ThirdFrame
    global USERNAME
    global USER_TYPE
    
    USERNAME = Username #Received from login
    USER_TYPE = User_type #Received from login
    
    load_config_settings() #Load config settings first
    load_all_settings(int(FILETYPE_CONFIG)) #Load all settings based on config
    
    root = tk.Tk()
    #Create a window as defined in the AppWindow class
    mainWindow = AppWindow(root)

    #Create a Frame as defined in class MainFrame
    FirstFrame = MainFrame(mainWindow)
    FirstFrame.grid(row=0, column=1, rowspan=2, sticky="NWES") #Positioning Frame on Window
    #Create a Frame as defined in class SearchFrame
    SecondFrame = SearchFrame(mainWindow)
    SecondFrame.grid(row=0, column=0, sticky="NWES") #Positioning Frame on Window
    #Create a Frame as defined in class ScrollFrame
    ThirdFrame = ScrollFrame(mainWindow)
    ThirdFrame.grid(row=1, column=0, sticky="NWES") #Positioning Frame on Window
    
    root.mainloop()


if __name__ == "__main__":
    if os.path.exists(USERS_FILE) == True:
        #Start login window 
        login = login.Login(icon="LegalNotesApp_icon.ico",
                            users_file=USERS_FILE,
                            modus="advanced",
                            command=lambda:start_application(login.username_entry_var.get(), login.account_type))
    else:

        start_application(Username="Administrator", User_type = "")

在这里您可以找到登录库的相关部分：

class Login(tk.Tk):
    def __init__(self,
                 title="Login",
                 command="pass",
                 accounts={},
                 users_file="",
                 modus="simple"):
        tk.Tk.__init__(self)
        self.resizable(0,0) #Window not resizable
        self.attributes("-topmost", 1) #Topmost window
        self.focus_force()
        
        
        #Passing through variables
        self.command = command #Action when login is succesful
        self.title(title) #Title of window
        self.users_dict = accounts #Dictonary of users & passes
        self.users_file = users_file #File to load/save dictonary of users & passes
        self.modus = modus #Account modus: simple, advanced, custom?


def login_event(self, *args):
        #Event when login button is pressed
        
        if self.users_dict != {}: #Check whether users are available
            
            #STEP 1: Check for empty fields
            if self.username_entry.get() != "" and self.password_entry.get() != "": #check wether username is not empty
            
                #STEP 2: Check for modus: "simple", "advanced", "custom"?
                if self.modus == "simple": #MODUS
                
                    if self.password_entry.get() == self.users_dict.get(self.username_entry.get()): #Check password
                        #Succesful login
                        self.destroy() #Login window not needed after login
                        self.command() #Action determined by user

是什么导致后台进程？以及如何防止它发生？或者我能做些什么更好？

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