Question

我正在学习while循环，并为该项目编写了此代码，该代码通过了除一个条件之外的所有资格。一种是当用户点击回车（不输入任何内容）时，它应该继续询问。我在程序中无法建立它。下面的代码：

def str_analysis(question):
    while True:   
        if question.isdigit() == True:
            if int(question) > 99:
                print (question,"is a big number!")
                break
            else:
                print (question,"is a small number!")
                break     
        if question.isalpha() == True:
            print (question,"is all alphabetical characters!")
            break
        else:
            print (question, "is neither all alpha nor all digit.")
            break


str_analysis(question = input("Enter word or integer: "))

我尝试将其放在

下

while True:
if question == "":
print ("")

希望它会继续问但是当我这样做时，它只会跳到（问题，“既不是全字母，也不是全数字。”）

Answer 1

可以稍微清理一下，但只解决了您的问题。

def str_analysis(question):
    while True:

        if question.isdigit() == True:

            if int(question) > 99:
                print (question,"is a big number!")
                break

            else:
                print (question,"is a small number!")
                break


        elif question.isalpha() == True:
            print (question,"is all alphabetical characters!")
            break

        else:

            print (question, "is neither all alpha nor all digit.")
            question = input("Enter word or integer: ")





str_analysis(question = input("Enter word or integer: "))

Answer 2

可以使用while-loop来解决：

question = input("Enter word or integer: ")

def str_analysis(question):
    while True:   
        if question.isdigit() == True:
            if int(question) > 99:
                print (question,"is a big number!")
                break
            else:
                print (question,"is a small number!")
                break     
        if question.isalpha() == True:
            print (question,"is all alphabetical characters!")
            break
        else:
            print (question, "is neither all alpha nor all digit.")
            break


while len(question) == 0:
    question = input("Enter word or integer: ")

str_analysis(question)

工作原理：

每次用户按 Enter 时，它都会不断询问。

Python中的空白输入

2 个答案: