Question

程序的要点是询问用户的姓名（自动将第一个字母大写）。

然后会询问年龄和性别。如果年龄超过130或为负，则会产生错误

该程序应打印出所有信息，但我无法弄清楚while循环条件。任何人都可以帮我弄清楚while循环条件吗？

-edit-虽然Pastebin的链接已被删除，但我认为那里有重要的信息。所以，我仍然会给你链接： http://pastebin.com/UBbXDGSt

name = input("What's your name? ").capitalize()
age = int(input("How old are you "))
gender = input("From what gender are you? ").capitalize()

while #I guess I should write something behind the "while" function. But what?
    if age >= 130:
        print("It's impossible that you're that old. Please try again!")
    elif age <= 0:
        print('''It should be logical that ages are written in positive numbers! Well, try again! =)''')

age = int(input("How old are you? "))   

print("Your name is ",name, ". You are ", age, "years old." "\nYou are ", gender, ".")

Answer 1

如果有有效输入，您可以设置一个标记。这将解决您的while循环

的问题

 name = input("What's your name? ").capitalize()
 gender = input("From what gender are you? ").capitalize()
 ok = False #flag
 while not ok:
    age = int(input("How old are you "))
    if age >= 130:
       print("It's impossible that you're that old. Please try again!")
    elif age <= 0:
       print('''It should be logical that ages are written in positive numbers! Well, try again! =)''')
    else:
       ok = True
 print("Your name is ",name, ". You are ", age, "years old." "\nYou are ", gender, ".")

Answer 2

通常在这里使用while True。

while True:
    age = int(input("How old are you? "))

    if age >= 130:
        print("It's impossible that you're that old. Please try again!")
    elif age <= 0:
        print('''It should be logical that ages are written in positive numbers! Well, try again! =)''')
    else:
        break

这会重复这个问题，直到得到一个可接受的答案，在这种情况下，break将会脱离循环。

为了完整起见，您还应该检查他们输入了什么，并且他们输入了一个数字。在这里，我还将使用continue，它将从一开始就重新启动循环，忽略其余的代码。这是一个很好的例子：

while True:
    age = input("How old are you? ")
    if not age:
        print("Please enter your age.")
        continue
    try:
        age = int(age)
    except ValueError:
        print("Please use numbers.")
        continue

    if age >= 130:
        print("It's impossible that you're that old. Please try again!")
    elif age <= 0:
        print('''It should be logical that ages are written in positive numbers! Well, try again! =)''')
    else:
        break

新手坚持在Python中轻松“重复”重复

2 个答案: