按钮不工作的Tkinter命令[重复]

button = Button(root, text = "Choose", command=self.select()) 到 button = Button(root, text = "Choose", command=self.select) . 注意self后面删除的括号。选择这样,该方法只会被引用,直到您按下按钮才实际执行。

command=self.food() :

button = Button(root, text="Choose", command=self.select)

作为旁注,您生成 OptionMenu

option = OptionMenu(root, self.var, *food)

tkinterbook .

(按下按钮时调用的函数或方法。回调可以是函数、绑定方法或任何其他可调用的Python对象。如果不使用此选项,则用户按下按钮时不会发生任何事情。)

from Tkinter import *

class App:

    def __init__(self, root):
        self.title = Label(root, text="Choose a food: ",
                           justify = LEFT, padx = 20).pack()
        self.label = Label(root, text = "Please select a food.")
        self.label.pack()

        self.var = StringVar()
        self.var.set("Apple")
        food = ["Apple", "Banana", "Pear"]
        option = apply(OptionMenu, (root, self.var) + tuple(food))
        option.pack()

        button = Button(root, text = "Choose", command=self.select)
        #use function name instead of aclling the function
        button.pack()

    def select(self):
        selection = "You selected the food: " + self.var.get()
        print(selection) #debug message
        self.label.config(text = selection)

if __name__ == '__main__':
    root = Tk()
    app = App(root)
    root.mainloop()