Thomas Heller wrote:
I cannot understand why people are against adding it to stdlib (after
the name, the implementation, and the exact place have been decided).
It's certainly a useful data type, isn't it?
It depends on the precise semantics. You often want a dictionary where
the keys come out in some order - but that is rarely the order in which
they were added to the dictionary. Most frequently, you want the keys
sorted, according to some criteria. If not that, I would assume that you
typically have the order of keys determined before even filling the
dictionary, in which case you can do
for k in keys_in_preferred_order:
v = hashtable[k]
process(k,v)
I remember having needed that once in the past 15 years (in Smalltalk
at the time), so I wrote an OrderedDictionary for Smalltalk/V (which
didn't have it). It took me an hour or so.
I don't recall what precisely it was that I needed it for, and I cannot
think of any use case for the data type right now.
So I'm -0 on adding the data type: I have a vague feeling it is needed,
but rarely, and I don't know precisely what for.
Regards,
Martin
_______________________________________________
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
