python环境GUI程序整理更新

import tkinter as tk
from tkinter import messagebox
root=tk.Tk()
root.title("旺财养牛场")
root.geometry("500x400+200+300")
tk.Button(root,text="大公牛",font=('Arial',22),bg="green").pack(fill="x",side="top")
tk.Button(root,text="大母牛",font=('Arial',22),bg="green").pack(fill="x",side="bottom")
tk.Button(root,text="小牛",font=('Arial',22),bg="green").pack(fill="x",expand=1)

#tk.Label(root,text="大公牛",bg="green").pack(expand=1)

#tk.Label(root,text="大母牛",bg="green").pack(expand=1)

#tk.Label(root,text="小牛",bg="green").pack(expand=1)
def songhua(e):
    messagebox.showinfo("message1","放干草、放苞米")
    print("启动设备：筛子")
def 喂牛(i):
    messagebox.showinfo("message2","放干草加豆饼")
    print("启动设备：筛子、搅料机")
def 喂牛犊(x):
    messagebox.showinfo("message3","放干草拌苞米面加盐")
    print("启动设备：筛子、搅料机")
root.bind('',songhua)    #按钮和事件绑定此处为左键，中键，右键
root.bind('',喂牛)
root.bind('',喂牛犊)

root.mainloop()