[Python-ideas] Dict-like object with property access
g.brandl at gmx.net
Tue Jan 31 08:10:03 CET 2012
Am 30.01.2012 20:23, schrieb Ethan Furman:
> Antoine Pitrou wrote:
>> On Mon, 30 Jan 2012 12:49:54 -0600
>> Massimo Di Pierro
>> <massimo.dipierro at gmail.com> wrote:
>>> Trying to make sure I understand where we disagree and perhaps explain my problem better. For me this has very little to do with dictionaries.
>>> STEP 2) We can now overload the  to make the dynamic attributes accessible in an alternative syntax:
>>> class Dummy(object):
>>> def __getitem__(self,key): return getattr(self,key)
>>> def __setitem__(self,key,value): return setattr(self,key,value)
>>> d = Dummy()
>>> d.something = 5
>>> d['something'] = 5
>>> print d.something
>>> print d['something']
>>> STEP 3) Is anybody calling this un-pythonic?
>> Yes. You don't need both kinds of accesses.
> Sure you do -- as soon as 'something' can be passed in via a variable:
> def some_func(name):
> print(d.name) # uh, no
> print(d[name]) # okay, this works
If anything, the d.[name] (short for getattr(d, name)) proposal should be
reconsidered. But IIRC it was concluded when discussed last time that the
syntax is too hard to quickly distinguish from item access, and a better
one couldn't be found.
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