注:%.2f是将该浮点数float保留两位小数

代码如下:

xiaofei= eval(input("(少于1000不干)购物款数:"))
if xiaofei>= 5000:
    print("优惠价:%.2f" % (xiaofei*0.8))
elif xiaofei>= 3000:
    print("优惠价:%.2f" % (xiaofei* 0.85))
elif xiaofei>= 2000:
    print("优惠价:%.2f" % (xiaofei* 0.9))
elif xiaofei>= 1000:
    print("优惠价:%.2f" % (xiaofei* 0.95))
else:
    print("小伙儿你这买太少了,折扣没有(得加钱)")

效果如下:

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