Python：如何在20次循环后停止循环并将结果打印在用户输入的列表上？

Question

numlist = [] 
maxnumlist = 20
while len(numlist) < maxnumlist:
    item = input("Enter a number: ")
numlist.append(item)
print numlist
print "Here are some stats"
print (numlist)
lowestnum = min(numlist)
highestnum = max(numlist)
total = sum(numlist)
ave = float(sum(numlist)) / len(numlist)
print (lowestnum)
print (highestnum)
print (total)
print (ave)
input("\n\nPress the enter key to exit.")

我需要程序以这种方式运行：用户输入任意数字，分别输入20次（因此，该问题将循环20次），Python将获取所有最近输入的数字，并计算总和，最小值，最大值和平均值。 然后，Python打印/显示这些计算

由于某种原因，无论我尝试什么，我都无法使其正常运行。 我为此花了6天，真是迷失了。 我只是想解决这个问题，所以我可以尝试向它学习，然后继续前进。 我敢打赌，这是一个非常简单的解决方案，但超出了我的范围。

谢谢

Answer 1

您的缩进是错误的numlist.append(item)在while循环之外，因此列表永远不会增长，并且while运行无限次

numlist = [] 
maxnumlist = 20
while len(numlist) < maxnumlist:
    item = input("Enter a number: ")
    # notice this statement is inside while loop
    numlist.append(item)
print numlist
print "Here are some stats"
print (numlist)
lowestnum = min(numlist)
highestnum = max(numlist)
total = sum(numlist)
ave = float(sum(numlist)) / len(numlist)
print (lowestnum)
print (highestnum)
print (total)
print (ave)
input("\n\nPress the enter key to exit.")

Answer 2

没有错误消息很难说，但是我相信您要做的就是缩进numlist.append(item)行。 正如代码现在所读取的那样，用户输入20个数字，但是numlist仅append s的最后一个数字，因为numlist.append(item)在while循环之外。

Answer 3

如前所述，您缩进了一行

numlist = [] 
maxnumlist = 20
while len(numlist) < maxnumlist:
    item = input("Enter a number: ")
    numlist.append(item)

print numlist
print "Here are some stats"
print (numlist)
lowestnum = min(numlist)
highestnum = max(numlist)
total = sum(numlist)
ave = float(sum(numlist)) / len(numlist)
print (lowestnum)
print (highestnum)
print (total)
print (ave)
input("\n\nPress the enter key to exit.")

结果：

Enter a number: 1
Enter a number: 2
Enter a number: 3
Enter a number: 4
Enter a number: 5
Enter a number: 6
Enter a number: 7
Enter a number: 8
Enter a number: 9
Enter a number: 10
Enter a number: 11
Enter a number: 12
Enter a number: 13
Enter a number: 14
Enter a number: 15
Enter a number: 16
Enter a number: 17
Enter a number: 18
Enter a number: 19
Enter a number: 20
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
Here are some stats
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
1
20
210
10.5