python怎么变各种颜色_如何在Python中改变颜色？

from tkinter import *

def move():

global x1, y1, dx, dy, flag, n

x1, y1 = x1 + dx, y1 + dy

if x1 > 360:

n = 0

x1, dx, dy = 360, 0, 15

if y1 > 360:

n = 1

y1, dx, dy = 360, -15, 0

if x1 < 10:

x1, dx, dy = 10, 0, -15

n = 2

if y1 < 10:

y1, dx, dy = 10, 15, 0

n = 3

can1.coords(oval1, x1, y1, x1 + 30, y1 + 30)

if flag > 0:

abl1.after(50, move)

def stop():

global flag

flag = 0

def start():

global flag

if flag == 0:

flag = 1

move()

###

x1, y1 = 10, 10

dx, dy = 15, 0

color = [["white"], ["red"], ["green"], ["blue"]]

n = 0

flag = 0

###

abl1 = Tk()

abl1.title("Animációs gyakorlat Tkinter-rel")

can1 = Canvas(abl1, bg = "dark grey", height = 400, width = 400)

can1.pack(side=LEFT)

oval1 = can1.create_oval(x1, y1, x1 + 30, y1 + 30, fill = color[n])

but1 = Button(abl1, text = "Quit", command = abl1.destroy).pack(side=BOTTOM)

but2 = Button(abl1, text = "Start", command = start).pack()

but3 = Button(abl1, text = "Stop", command = stop).pack()

abl1.mainloop()

当球到达正方形的边缘时，它必须改变颜色。现在有了这个颜色列表，如果有了ifs，它什么也做不了，我也不知道出了什么问题。我尝试了很多不同的变体，但也没用。

谢谢你的帮助。在