如何从python中的字符串中检索关键字参数? [英] How retrieve keyword arguments from a string in python?

问题描述

比方说，我有一个字符串:

Let's say, I have a string:

  > my_string = '{foo}/{bar}'
  > my_string.format(foo='foo', bar='bar')
  'foo/bar'

对，很酷.但就我而言，我想检索my_string中的关键字参数.我已经完成了:

Right, cool. But in my case, I want to retrieve which are the keywords arguments in my_string. I have done:

 > ATTRS_PATTERN = re.compile(r'{(?P<variable>[_a-z][_a-z0-9]*)}')
 > ATTRS_PATTERN.findall(my_string)
 ['foo', 'bar']

这不是很性感.你有更好的主意吗?

It's not very sexy. Do you have any better idea ?

推荐答案

为什么要重新发明轮子? string.Formatter具有 parse()函数.

Why reinvent the wheel? string.Formatter has the parse() function.

>>> import string
>>> [a[1] for a in string.Formatter().parse('{foo}/{bar}')]
['foo', 'bar']

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