在python字符串中插入这些破折号的最快方法? [英] Fastest way to insert these dashes in python string?

问题描述

所以我知道 Python 字符串是不可变的，但我有一个字符串:

So I know Python strings are immutable, but I have a string:

c['date'] = "20110104"

我想转换成什么

c['date'] = "2011-01-04"

我的代码:

c['date'] = c['date'][0:4] + "-" + c['date'][4:6] + "-" + c['date'][6:]

看起来有点复杂，不是吗?最好将它保存为一个单独的变量，然后再做同样的事情吗?还是基本没有区别?

Seems a bit convoluted, no? Would it be best to save it as a separate variable and then do the same? Or would there basically be no difference?

推荐答案

你可以使用 .join() 来清理一下:

You could use .join() to clean it up a little bit:

d = c['date']
'-'.join([d[:4], d[4:6], d[6:]])

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