python字符串排序方法
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'
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'
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

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