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python字符串排序方法

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Release： 2016-06-16 08:42:19
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本文以实例形式简述了Python实现字符串排序的方法，是Python程序设计中一个非常实用的技巧。分享给大家供大家参考之用。具体方法如下：

一般情况下，python中对一个字符串排序相当麻烦：

一、python中的字符串类型是不允许直接改变元素的。必须先把要排序的字符串放在容器里，如list。

二、python中的list容器的sort()函数没返回值。

所以在python中对字符串排序往往需要好几行代码。

具体实现方法如下：

>>> s = "string"
>>> l = list(s)
>>> l.sort()
>>> s = "".join(l)
>>> s
'ginrst'
Copy after login

对于刚从C/C++等语言转过来的程序员往往会觉得很习惯，因为在C/C++里这些都是一行语句可以搞定的事情。因此，这里给出了一个简单的字符串排序方法。

实现代码如下：

>>> s = "string"
>>> s = "".join((lambda x:(x.sort(),x)[1])(list(s)))
>>> s
'ginrst'
Copy after login

因为用了lambda，稍为有点难理解，但想通了就好了。

希望本文所述对大家的Python程序设计有所帮助

Related labels：
python string sort method
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