一个简单的登录窗口布局，可以用于日常快速搭建一个简单的窗口类。

from tkinter import *
import tkinter.messagebox

class LoginUi:
    def __init__(self,window):
        self.window = window

    #初始化窗口
    def initWindow(self):
        self.width = 200
        self.height = 100
        #设置窗口宽高和位子
        self.window.geometry("%dx%d+%d+%d" % (self.width, self.height,
                                              (self.window.winfo_screenwidth() - self.width)/2,
                                              (self.window.winfo_screenheight()-self.height)/2))
        #标题
        self.window.title("登录窗口")
        #标签
        self.userNameLabel = Label(self.window, text="帐号：")
        self.userNameLabel.grid(row=0, column=1, columnspan=1)
        #输入框
        self.userNameEntry = Entry(self.window, bd=5)
        self.userNameEntry.grid(row=0, column=2, columnspan=1)

        self.passwordLabel = Label(self.window, text="密码：")
        self.passwordLabel.grid(row=1, column=1, columnspan=1)
        self.passwordEntry = Entry(self.window, bd=5)
        self.passwordEntry.grid(row=1, column=2, columnspan=1)
        #按钮
        self.checkButton = Button(self.window, text="登录", command=self.checkCallBack)
        self.checkButton.grid(row=2, column=2, columnspan=1)

    def checkCallBack(self):
        if self.userNameEntry.get() == "" or self.passwordEntry.get() == "":
            tkinter.messagebox.showinfo('提示','请输入帐号或者密码！')
        if self.userNameEntry.get() == "123" and self.passwordEntry.get() == "123":
            tkinter.messagebox.showinfo('提示','密码正确！')
        else:
            tkinter.messagebox.showinfo('提示', '密码错误！')


def login():
    loginWindow = Tk() #创建窗口
    window = LoginUi(loginWindow) #类初始化
    window.initWindow() #窗口添加组件
    loginWindow.mainloop() #载入窗口循环


login()

 效果如下：