限制输入一个字

Question

因此，这里是我的代码：

sentence=input('Please input a sentence: ').lower() 
word=input('What word would you like to select? ').lower() 
words=sentence.split() 
for (A, keyword) in enumerate(words): 
    if(keyword==word): 
     print(A+1) 
if(keyword!=word): 
     print ('This word is not in the sentence') 

我需要将用户输入限制为只有一个字，如果他们输入2个字，如何将我去这个返回的错误信息？

Answer 1

检查分割输入的长度大于1：

word = input('What word would you like to select? ').lower() 
if len(word.split()) > 1: 
    raise Exception("Input must be a single word")