python简单登录窗口

代码如下：

from tkinter import *
from tkinter import messagebox

class Application(Frame):

    def __init__(self, master=None):
        super().__init__(master)
        self.master = master
        self.pack()
        self.creatWidget()

    def creatWidget(self):
        self.Label01 = Label(self, text='用户名')
        self.Label01.pack()

        v1 = StringVar()
        self.entry01 = Entry(self, textvariable=v1)
        self.entry01.pack()

        self.Label02 = Label(self, text='密码')
        self.Label02.pack()

        v2 = StringVar()
        self.entry02 = Entry(self, textvariable=v2, show="*")
        self.entry02.pack()

        Button(self, text="登录", command=self.login).pack()


    def login(self):
        username = self.entry01.get()
        pwd = self.entry02.get()
        print("去数据库比对用户名和密码!")
        print("用户名："+username)
        print("密码："+pwd)

        #abcd和123321分别是用户名、密码，可以随意修改
        if username=='abcd' and pwd=="123321":
            messagebox.showinfo("xx登录系统", "登录成功！")
        else:
            messagebox.showinfo("xx登录系统","用户名或密码错误！")

if __name__=='__main__':
    root = Tk()
    root.geometry("400x130+300+200")    #四个数字分别代表窗口宽度，高度，距屏幕左边，上边距离
    app = Application(master=root)
    root.mainloop()