用python中的tkinter模块编译一个主窗体含有登录和退出键。点击登录可以进入另一个窗体，在另一个窗体中可以玩五子棋。点击退出直接退出。

以下是一个简单的五子棋小游戏，包含登录和退出按钮。

import tkinter as tk
import tkinter.messagebox as msgbox

class MainWindow:
    def __init__(self, master):
        self.master = master
        master.title("五子棋小游戏")
        
        # 创建登录和退出按钮
        self.login_button = tk.Button(master, text="登录", command=self.login)
        self.login_button.pack(side="left", padx=10, pady=10)
        
        self.quit_button = tk.Button(master, text="退出", command=self.quit)
        self.quit_button.pack(side="left", padx=10, pady=10)
        
    def login(self):
        # 进入另一个窗体
        login_window = tk.Toplevel(self.master)
        login_window.title("登录")
        
        # 创建用户名和密码输入框
        tk.Label(login_window, text="用户名:").grid(row=0, column=0)
        self.username_entry = tk.Entry(login_window)
        self.username_entry.grid(row=0, column=1)
        
        tk.Label(login_window, text="密码:").grid(row=1, column=0)
        self.password_entry = tk.Entry(login_window, show="*")
        self.password_entry.grid(row=1, column=1)
        
        # 创建登录按钮
        login_button = tk.Button(login_window, text="登录", command=self.check_login)
        login_button.grid(row=2, column=1, pady=10)
        
    def check_login(self):
        # 检查用户名和密码是否正确
        username = self.username_entry.get()
        password = self.password_entry.get()
        
        if username == "admin" and password == "123456":
            # 登录成功，进入游戏窗口
            self.game_window = tk.Toplevel(self.master)
            self.game_window.title("五子棋")
            self.game = Game(self.game_window)
        else:
            # 登录失败，弹出提示框
            msgbox.showerror("错误", "用户名或密码错误")
            
    def quit(self):
        # 退出程序
        self.master.quit()

class Game:
    def __init__(self, master):
        self.master = master
        self.turn = "black"
        self.board = [[None for _ in range(15)] for _ in range(15)]
        
        # 创建棋盘
        self.canvas = tk.Canvas(master, width=450, height=450, bg="#F0D9B5")
        self.canvas.pack()
        
        for i in range(15):
            self.canvas.create_line(30, 30 + i*30, 420, 30 + i*30)
            self.canvas.create_line(30 + i*30, 30, 30 + i*30, 420)
            
        # 创建落子事件
        self.canvas.bind("<Button-1>", self.drop_piece)
        
    def drop_piece(self, event):
        x, y = event.x, event.y
        row, col = (y - 30) // 30, (x - 30) // 30
        
        if self.board[row][col] is None:
            if self.turn == "black":
                self.canvas.create_oval(30 + col*30 - 13, 30 + row*30 - 13, 30 + col*30 + 13, 30 + row*30 + 13, fill="black")
                self.board[row][col] = "black"
                self.turn = "white"
            else:
                self.canvas.create_oval(30 + col*30 - 13, 30 + row*30 - 13, 30 + col*30 + 13, 30 + row*30 + 13, fill="white")
                self.board[row][col] = "white"
                self.turn = "black"
                
            if self.check_win(row, col):
                winner = "黑方" if self.turn == "white" else "白方"
                msgbox.showinfo("游戏结束", f"{winner}获胜！")
                self.master.destroy()
                
    def check_win(self, row, col):
        # 判断是否五子连珠
        def count(dx, dy):
            cnt = 0
            while 0 <= row+dx <= 14 and 0 <= col+dy <= 14 and self.board[row+dx][col+dy] == self.board[row][col]:
                cnt += 1
                dx, dy = dx+dx, dy+dy
            return cnt
        
        if count(1, 0) + count(-1, 0) >= 4: return True
        if count(0, 1) + count(0, -1) >= 4: return True
        if count(1, 1) + count(-1, -1) >= 4: return True
        if count(1, -1) + count(-1, 1) >= 4: return True
        
        return False

root = tk.Tk()
app = MainWindow(root)
root.mainloop()