【编测编学】零基础学python_04_字符串(删除空白)

osc_kd8rd7b3 2020-11-15 08:01:23
Python strip


删除字符串中的空白:

在程序中,额外的空白可能令人迷惑。对程序员来说,'python' 和'python ' 看起来几乎没什么两样,但对程序来说,它们却是两个不同的字符串。Python能够发现'python ' 中额外的空白,并认为它是有意义的——除非你告诉它不是这样的。空白很重要,因为你经常需要比较两个字符串是否相同。例如,一个重要的示例是,在用户登录网站时检查其用户名。但在一些简单得多的情形下,额外的空格也可能令人迷惑。

所幸在Python中,删除用户输入的数据中的多余的空白易如反掌。

Python能够找出字符串开头和末尾多余的空白。要确保字符串末尾没有空白,可使用方法rstrip() 。
【编测编学】零基础学python_04_字符串(删除空白)

favorite_teacher = '青云 '+ '利剑'
print(favorite_teacher)
favorite_teacher = '青云 '.rstrip()+ '利剑'
print(favorite_teacher)


存储在变量favorite_teacher中的字符串末尾包含多余的空白。你在print输出这个变量的值时,可看到末尾的空格。对 字符串'青云 '调用方法rstrip() 后,这个多余的空格被删除了。

你还可以剔除字符串开头的空白,使用方法lstrip()

favorite_teacher = '青云'+ ' 利剑'
print(favorite_teacher)
favorite_teacher = '青云'+ ' 利剑'.lstrip()
print(favorite_teacher)
执行结果如下,一目了然:



【编测编学】零基础学python_04_字符串(删除空白)

同时剔除字符串两端的空白,使用方法 strip()

直接上示例代码:

favorite_teacher = '青云'+ ' 利剑 '+'刀锋'
print(favorite_teacher)
favorite_teacher = '青云'+ ' 利剑 '.strip()+'刀锋'
print(favorite_teacher)
执行结果如下:



【编测编学】零基础学python_04_字符串(删除空白)

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https://my.oschina.net/u/4416268/blog/4717554

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