检查空格是否在字符串中 [英] Check if space is in a string

问题描述

' ' in word == True

我正在编写一个程序来检查字符串是否是单个单词.为什么这不起作用，有没有更好的方法来检查字符串是否没有空格/是单个单词..

解决方案

== 优先于 in，因此您实际上是在测试 word ==真的.

<预><代码>>>>w = 'ab c'>>>' ' 在 w == 真1:错误>>>(' ' in w) == True2:真的

但是您根本不需要 == True.if 需要 [something that evaluate to True or False] 并且 ' ' in word 将评估为真或假.所以，if ' ' in word: ... 就好了:

<预><代码>>>>' ' 在 w3:真的

' ' in word == True

I'm writing a program that checks whether the string is a single word. Why doesn't this work and is there any better way to check if a string has no spaces/is a single word..

解决方案

== takes precedence over in, so you're actually testing word == True.

>>> w = 'ab c'
>>> ' ' in w == True
1: False
>>> (' ' in w) == True
2: True

But you don't need == True at all. if requires [something that evalutes to True or False] and ' ' in word will evalute to true or false. So, if ' ' in word: ... is just fine:

>>> ' ' in w
3: True

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