pythontkinter，通过lambda表达式传递参数到按钮的点击事件函数

　　给tkinter的按钮添加点击事件处理函数，可以在创建按钮时将定义好的函数赋值给它的command属性，即tk.Button(window, text=＂this is a button＂, command=clickFunc())
　　如果在点击按钮执行函数时还要传递参数，就要用到lambda了，写成以下形式tk.Button(window, text=＂=＂, command=lambda: clickFunc(x, y, z))
　　写一个完整的小例子，来计算c = a + bimport tkinter as tk   def add(x, y, z):     x = int(x.get())     y = int(y.get())     z.set(str(x + y))   def windows():     window = tk.Tk()      x = tk.StringVar()     a = tk.Entry(window, textvariable=x)     a.pack()     a.place(x=20, y=100, width=20)     x.set(1)      addLabel = tk.Label(window, text=＂+＂)     addLabel.pack()     addLabel.place(x=45, y=98)      y = tk.StringVar()     b = tk.Entry(window, textvariable=y)     b.pack()     b.place(x=60, y=100, width=20)     y.set(1)      z = tk.StringVar()     c = tk.Entry(window, textvariable=z)     c.pack()     c.place(x=120, y=100, width=20)      equalButton = tk.Button(window, text=＂=＂, command=lambda: add(x, y, z))     equalButton.pack()     equalButton.place(x=90, y=98)      window.mainloop()   if __name__ == ＂__main__＂:     windows()