这是我当前的代码:

while True:
        try:
            mylist = [0] * 7
            for x in range(7):
                    sales = float(input("Sales for day:"))
                    mylist[x] = sales
                    if  sales < 0:
                        print ("Sorry,invalid. Try again.")
        except:
            print ("Sorry, invalid. Try again.")
        else:
            break

print (mylist)

best = max(sales)
worst = min(sales)

print ("Your best day had", best, "in sales.")
print ("Your worst day had", worst, "in sales.")


当我运行它时,我得到以下信息:

Sales for day:-5
Sorry,invalid. Try again.
Sales for day:-6
Sorry,invalid. Try again.
Sales for day:-7
Sorry,invalid. Try again.
Sales for day:-8
Sorry,invalid. Try again.
Sales for day:-9
Sorry,invalid. Try again.
Sales for day:-2
Sorry,invalid. Try again.
Sales for day:-5
Sorry,invalid. Try again.
[-5.0, -6.0, -7.0, -8.0, -9.0, -2.0, -5.0]
Traceback (most recent call last):
  File "C:/Users/Si Hong/Desktop/HuangSiHong_assign9_part.py", line 45, in <module>
    best = max(sales)
TypeError: 'float' object is not iterable


我不太确定如何编写代码,这样列表就不会采用负值,因为我只想要0或更大的值。

我不确定如何解决TypeError问题,以便最小值和最大值将按我的代码显示

我的最后一个问题是,如果要查找用户输入的七个输入的平均值,应该如何将这些值从列表中拉出

非常感谢

最佳答案

最好的选择是将数据检查放入while循环中。这将一直循环遍历该值,直到满足您的条件为止(>0

同样,这可能会使用户弄不清楚他们输入结果的日期。另外,您需要使用列表中的最大值/最小值,而不是单个值。放在一起,进行以下更改:

        for x in range(7):
            sales=-1
            while (sales<0):
                sales = float(input("Sales for day {0}".format(x)))
                mylist[x] = sales
                if  sales < 0:
                    print ("Sorry,invalid. Try again.")


然后进行更改:

best = max(my_list)
worst = min(my_list)

08-18 03:41
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