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在海龟编辑器中试一试吧

import time
import turtle
turtle = turtle.Pen()
turtle.hideturtle()
a = int(input('你一共有多少钱？  '))
b = int(input('商品价钱： '))
target = a - b
money = [50, 20, 10, 5, 2, 1]
number = [0, 0, 0, 0, 0, 0]
color = ['red', 'green', 'blue', 'purple', 'yellow' ,'orange']
print('要找的钱为', target, '元')
time.sleep(1)
for i in range(6):
    number[i] = target // money[i]
    target = target % money[i]
for i in range(6):
    print(money[i], '元的张数为', number[i], '张')
    time.sleep(1)
    turtle.pencolor(color[i])
    turtle.forward(number[i] * 50)
    turtle.dot(5)