Python 利用StringVar接收用户输入, 制作用户名和密码的验证登录窗口

Python3 使用tkinter制作了一个简单的验证登陆窗口
messagebox为弹窗提醒

import tkinter as tkfrom tkinter import messageboxclass verification_window(tk.Frame):    # 调用时初始化    def __init__(self):        global root        root = tk.Tk()        # 窗口大小设置为150x150        root.geometry('150x150+885+465')        root.resizable(0, 0)  # 窗口大小固定        super().__init__()        self.username = tk.StringVar()        self.password = tk.StringVar()        self.pack()        self.main_window()        root.mainloop()    # 窗口布局    def main_window(self):        global root        username_label=tk.Label(root,text='Username:',font=('Arial',12)).place(x=35,y=10)        username_input = tk.StringVar        username_entry=tk.Entry(root,textvariable=self.username).place(x=2,y=35)        password_label=tk.Label(root,text='Password:',font=('Arial',12)).place(x=35,y=58)        password_input = tk.StringVar        password_entry=tk.Entry(root,textvariable=self.password,show='*').place(x=2,y=83)        # 在按下CONFIRM按钮时调用验证函数        conformation_button = tk.Button(root,text='CONFIRM',command=self.verification,fg='white',bg='black', activeforeground='white', activebackground='navy',width=8,height=1)        conformation_button.place(x=6,y=112)        quit_button = tk.Button(root, text='QUIT', command=root.quit, fg='white', bg='black', activeforeground='white', activebackground='red', width=8, height=1)        quit_button.place(x=78,y=112)    # 验证函数    def verification(self):        global root        # 检查用户名和密码 是否在user_dict字典中        user_dict = {987654321:112233,123456789:332211}        if user_dict.get(int(self.username.get())) == int(self.password.get()):            # 成功提醒            messagebox.showinfo(title='Correct', message=f'{int(self.username.get())}, welcome!')              # 验证成功后打开main_gui窗口            #root.withdraw()            #from gui import main_gui            #main_gui.app()        else:            messagebox.showerror(title='Wrong inputs!', message='Please enter correct username or password.')  # 错误提醒if __name__ == '__main__':    verification_window()

效果图