Different types of dicts with letter before the curly braces.

[Stefan Behnel]

Hi,

this kind of stuff is commonly discussed on the python-ideas mailing list.
You might want to search that list and/or repost this over there.

Stefan

kindly wrote:
> I am sure people have thought of this before, but I cant find where.
> I think that python should adapt a way of defining different types of
> mapping functions by proceeding a letter before the curly brackets.
> i.e   ordered = o{},  multidict = m{}  (like paste multidict).  So you
> could define an ordered dict by newordered = o{"llvm" : "ptyhon",
> "parrot" : "perl"} .  (they should also probably have there own
> comprehensions as well o{foo for bar in foobar}).
> 
> People nowadays think in terms of hashes and lists (especially with
> jsons and javascript not going away} and most of my time seems to be
> spent in different ways to store bits of data in memory in this way.
> It also seems to be the way to think in python (an object or a class
> object are just mappings themselves) Most packages that I have seen re-
> implement these different container types at one point anyway. It
> seems a shame they are not brought up to the top level, with
> potentially new, cleverer ones that have not been thought of yet.
> There will be potential to add different letters to the start when it
> seems that a certain mapping pattern seems in popular use.
> 
> Am I crazy to think this is a good idea?  I have not looked deeply
> pythons grammer to see if it conflicts with anything, but on the
> surface it looks fine.