Python如何将列表中单词数≥5的句子替换为对应单词数

你可以直接用列表推导式快速实现需求，代码如下：

s = ['Two heads are better than one', 'Time flies', 'May the force be with you', 'I do', 'The Itchy and Scratchy Show', 'You know nothing Jon Snow', 'The cat ran']
result = [len(sentence.split()) if len(sentence.split()) >= 5 else sentence for sentence in s]
print(result)

如果你更习惯用循环写法，可读性更高的版本如下：

s = ['Two heads are better than one', 'Time flies', 'May the force be with you', 'I do', 'The Itchy and Scratchy Show', 'You know nothing Jon Snow', 'The cat ran']
sn = []
for sentence in s:
    word_cnt = len(sentence.split())
    if word_cnt >= 5:
        sn.append(word_cnt)
    else:
        sn.append(sentence)
print(sn)

你之前写的循环存在以下错误：

• 语法不完整，if 判断没有对应的执行分支和else分支
• sentence.split(i)写法错误，变量i没有定义，按空格拆分直接调用split()即可
• 判断条件错误，你需求里的阈值是单词数≥5，不是大于2

两种写法运行后都会输出你预期的结果：[6, 'Time flies', 6, 'I do', 5, 5, 'The cat ran']

内容的提问来源于stack exchange，提问作者Noob3000