On 10/11/14 23:08, Clayton Kirkwood wrote:
I couldn't find a way to get the len of blah.
What would you expect the answer to be?
I would expect len(sizeof, whatever)(blah) to return the number of (in this
case) matches, so 5.
But remember that search is matching the pattern, not the groups -
that's a side effect. So len(matchObject) could just as validly
return the length of the string that matched the pattern.
It just depends on the content that you are using.
of matches. Why else would you do a search
To look for a pattern. I very rarely use groups in regex - and
I try not to use regex at all! If I can find the matching substring
I will likely be able to pull out the details using regular string
methods or other tools. For example in your case I might have tried
using time.strparse()
certainly wouldn't want len(group) to return the number of characters, in
this case, 28 (which it does:>{{{
But group() - with default group of 0 - returns the whole matched
substring and len() on a string returns the number of characters.
You want len(match.groups()) to get the number of matches.
I didn't run group to find out the number of characters in a string, I ran
it to find out something about blah and its matches.
But group() - singular - returns a single group item which is always a
string. You use group() to get the matching substring. You use groups to
find all the substrings.
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.flickr.com/photos/alangauldphotos
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor
