带有嵌套after（）函数的Python ForLoop在循环之后发生

Question

我正在尝试创建一个函数，该函数将重复三次代码块。该代码有一个for循环，以500ms的间隔更改背景。我希望将其重复三遍。

for x in range(0,3):
    window.after(500, lambda: window.configure(bg = "blue"))
    window.after(1000, lambda: window.configure(bg = "green"))
    window.after(1500, lambda: window.configure(bg = "yellow"))
    window.after(2000, lambda: window.configure(bg = "purple"))
    window.after(2500, lambda: window.configure(bg = "red"))
    window.after(3000, lambda: window.configure(bg = "#a1dbcd"))
    print x

在IDE中，“ x”被打印三次，但是窗口背景仅循环一次。

有人可以帮助我解决此代码或找到另一种方法来完成此操作。谢谢。

Answer 1

松本费尔南多（Fernando Matsumoto）回答了您的问题，但这是一种稍微紧凑的方法。

import Tkinter as tk

bgcolors = ("blue", "green", "yellow", "purple", "red", "#a1dbcd")

def cycle():
    delta = 500
    delay = delta
    for x in range(3):
        for c in bgcolors:
            window.after(delay, lambda c=c: window.configure(bg=c))
            delay += delta
        print x

window = tk.Tk()
window.pack_propagate(0)

b = tk.Button(window, text='cycle bg', command=cycle)
b.pack()

window.mainloop()