在附加列表（用户输入）（Python）中计数和分离年龄

Question

我自己试图自己弄清楚这一点，但我无法获得想要的结果，而且我无法通过互联网找到正确的答案。我有一块代码，要求用户10年龄并将其存储在附录列表中，问题是我可以按年龄分开它们，但我不知道如何按年龄组来计数数量。我尝试寻找文档，但其中大多数是带有已知值列表的示例。谁能给我一些建议？ 到目前为止，这是我的代码：

age = []
for i in range (10):
    ag = int (input("Write your age"))
    age.append(ag)
print ("The number of kids are: ")
for i in range (10):
    if age [i] < 12:
        print (age [i])
print ("The number of teenagers are: ")
for i in range (10):
    if age [i] >=12 and age [i] < 17:
        print (age [i])
print ("The number of adults are: ")
for i in range (10):
    if age [i] >= 18:
        print (age [i])

Answer 1

仅使用一个循环，一个构建数据的循环，同时为每个类别增量计数器

ages = []
kids, teen, adult = 0, 0, 0

for i in range(10):
    age = int(input("Write your age"))
    ages.append(age)

    if age < 12:
        kids += 1
    elif age <= 17:
        teen += 1
    else:
        adult += 1

print("The number of kids is: ", kids)
print("The number of teenagers is: ", teen)
print("The number of adults is: ", adult)

Answer 2

一旦收集了年龄，就可以将它们过滤为子列表，类似：

ages = [5, 10, 17, 18, 20, 30, 50]

kids = [a for a in ages if a <= 12]
teens = [a for a in ages if a > 12 and a < 20]
adults = a for a in ages if a >= 20]

# print summaries
print(f'there are {len(kids)} kids: {kids}')
print(f'there are {len(teens)} teens: {teens}')

上面的示例是使用Python的功能，称为

您也可以明确地循环到项目上，并在需要时打印/填充值：

kids = []
teens = []
...
for age in ages:
    if age < 13:
        kids.append(age)
    elif age < 20:
        teens.append(age)
    else:
        ...
print('teens are', teens)