[Python-bugs-list] [ python-Feature Requests-739029 ] Constructor for counting things

[SourceForge.net]

Feature Requests item #739029, was opened at 2003-05-17 02:22
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=355470&aid=739029&group_id=5470

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: David Albert Torpey (dtorp)
Assigned to: Nobody/Anonymous (nobody)
Summary: Constructor for counting things

Initial Comment:
Counting things is very common.  May I suggest an 
alternate dictionary constructor that works like this:

class BetterDictionary(dict):
    def bag(classobject, sequence):
        "Fast way to count things"
        b = classobject()
        for k in sequence:
            b[k] = b.get(k,0) + 1
        return b
    bag = classmethod(bag)

print BetterDictionary.bag("jack and jill went up a 
hill ...")

A C implementation could do this very fast.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=355470&aid=739029&group_id=5470