Aahz schrieb:

On Mon, Mar 31, 2008, Mathias Panzenb?ck wrote:

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Maybe dictionary unpacking would be a nice thing?

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d = {'foo': 42, 'egg': 23} {'foo': bar, 'egg': spam} = d print bar, spam 42 23

What do you think? Bad idea? Good idea?

Horrible idea. ;-)

And your argumentation on this is?

Facundo Batista schrieb:

2008/3/31, Mathias Panzenböck :

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Maybe dictionary unpacking would be a nice thing?

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d = {'foo': 42, 'egg': 23} {'foo': bar, 'egg': spam} = d print bar, spam 42 23

Bad idea.

It uncovers a lot of details for your brain to take care when doing that, for example:

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d = {'foo': 42, 'egg': 23} {'not': bar, 'egg': spam} = d print bar ??? {'egg': bar, 'egg': spam} = d print bar ???

I would consider something like the following:

bar, spam = d.multiple("foo", "egg")

with the semantics of:

bar, spam = [d[k] for k in ("foo", "egg")]

We also have bar, spam = itemgetter("foo", "egg")(d) if some functional form is preferred. Georg -- Thus spake the Lord: Thou shalt indent with four spaces. No more, no less. Four shall be the number of spaces thou shalt indent, and the number of thy indenting shall be four. Eight shalt thou not indent, nor either indent thou two, excepting that thou then proceed to four. Tabs are right out.

Maybe just extend the functionality of the __getitem__ and __setitem__ methods of dicts?

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class xdict(dict): def __getitem__(self,key): if type(key) in (tuple, list): return (dict.__getitem__(self,k) for k in key) else: return dict.__getitem__(self,key)

def __setitem__(self,key,value): if type(key) in (tuple, list): for k, v in zip(key,value): dict.__setitem__(self,k,v) else: dict.__setitem__(self,key,value)

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d=xdict({'foo':23,'bar':42,'egg':'spam'}) d {'bar': 42, 'foo': 23, 'egg': 'spam'} d["foo",] list(d["foo",]) [23] list(d["foo","bar"]) [23, 42] a,b=d['foo','egg'] a,b (23, 'spam') d['baken','bar'] = 'tomato', 36 d {'bar': 36, 'foo': 23, 'egg': 'spam', 'baken': 'tomato'}

Well, this would break current behaviour, so actually no. Not good. But maybe that way (no conflict because lists are unhashable):

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class xdict(dict): def __getitem__(self,key): if isinstance(key,list): return (dict.__getitem__(self,k) for k in key) else: return dict.__getitem__(self,key)

def __setitem__(self,key,value): if isinstance(key,list): for k, v in zip(key,value): dict.__setitem__(self,k,v) else: dict.__setitem__(self,key,value)

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d=xdict({'foo':23,'bar':42,'egg':'spam'}) list(d[["foo"]]) [23] list(d[["foo","bar"]]) [23, 42] a,b=d[['foo','egg']] a,b (23, 'spam') d[['baken','bar']] = 'tomato', 36 d {'bar': 36, 'foo': 23, 'egg': 'spam', 'baken': 'tomato'}

The [[ ]] looks almost like a spacial syntax. Good or bad? -panzi