Rob Cowie wrote:
> I wish to derive two lists - each containing either tags to be
> included, or tags to be excluded. My idea was to take an element,
> examine what element precedes it and accordingly, insert it into the
> relevant list. However, I have not been successful.
>
> Is there a better way that I have not considered?
Maybe. You could write a couple regexes, one to find the included
tags, and one for the excluded, then run re.findall on them both.
But there's nothing fundamentally wrong with your method.
> If this method is
> suitable, how might I implement it?
tags = ['tag1', '+', 'tag2', '+', 'tag3', '-', 'tag4']
include, exclude = [], []
op = '+'
for cur in tags:
if cur in '+-':
op = cur
else:
if op == '+':
include.append(cur)
else:
exclude.append(cur)
--Ben
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