Alex Martelli wrote: > Steven Bethard <[EMAIL PROTECTED]> wrote: > >> Alex Martelli wrote: >> > If we had a "turn sequence into bag" function somewhere >> > (and it might be worth having it for other reasons): >> > >> > def bagit(seq): >> > import collections >> > d = collections.defaultdict(int) >> > for x in seq: d[x] += 1 >> > return d >> >> I use this function all the time -- I call it dicttools.count(). I'd >> love to see this appear in the collections module or somewhere else in >> the stdlib. > > Maybe you should propose it in python-dev -- it does seem a reasonable > utility addition to the collections module, after all.
Here's a patch implementing collections.counts() as suggested above: http://bugs.python.org/1696199 Example usage, from the docstring:: >>> items = 'acabbacba' >>> item_counts = counts(items) >>> for item in 'abcd': ... print item, item_counts[item] ... a 4 b 3 c 2 d 0 The documentation is a little terse, but the function was so simple, I wasn't really sure what more to say. STeVe _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com