Question

我是python的新手，如果没有输入，我无法让python循环遍历raw_input，并且在有输入之前再次循环问题。一旦有输入移动到下一个问题，例如

again = None
while again == None:
    name = raw_input("Hello, please enter your name?: ")
    if name:
        print "Hello %s I am soandso" % name
again = raw_input("Please type a name: ")

我知道这段代码全都搞砸了。只是想学习。

Answer 1

name = None
while not name:
    name = raw_input("Hello, please enter your name?: ")
    if name:
        print "Hello %s I am soandso" % name

Answer 2

您的代码中存在错误。你再次检查＆＃34; = =无＆＃34;在循环中，但永远不会改变＆＃34;再次＆＃34;价值，所以它总是等于＆＃34;无＆＃34;并且循环从不停止。

您可以将输入逻辑包装到函数中，然后提出多个问题：

def get_value(question):
    while True:
        response = raw_input(question)
        if response:
            return response


answer1 = get_value('What is your first name? ')
answer2 = get_value('What is your last name? ')

print('First name: {}, last name: {}'.format(answer1, answer2))

Answer 3

again = None
while again == None:
    name = raw_input("Hello, please enter your name?: ")
    if name:
        print "Hello %s I am soandso" % name
again = raw_input("Please type a name: ")

此循环永远不会停止，因为再次始终为None

Python：循环原始输入

3 个答案: