[Python-Dev] function for counting items in a sequence (original) (raw)
Georg Brandl g.brandl at gmx.net
Sun Apr 8 20:23:15 CEST 2007
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Steven Bethard schrieb:
A summary response to the issues raised so far...
On what the name should be: * Adam Olsen - countunique(), countdistinct(), countduplicates() * Greg Ewing - counteach(), countall() * Kevin Jacobs - tally() * Guido - counts() is fine So I guess I'll stick with counts().
I can live with counts(), though I always ask myself "who counts?" ;)
On whether the count of a missing item should be 0 or a KeyError: * Brett Cannon - 0 * Greg Ewing - 0 Because the number of times an unseen item was seen is 0. So I'll stick with returning 0. That's the normal behavior for a defaultdict(int).
+1 from me too for 0.
Raymond Hettinger suggested that the function should be called dict.fromcount() instead. I lean towards the collections module instead of a dict classmethod because the feedback above suggests that the count of an unseen item should be 0. This means returning a defaultdict(int), which might be a bit confusing from a classmethod of dict.
defaultdict.fromcount? Too obscure, I guess.
Georg
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