Clodoaldo Pinto wrote:
> I know how to format strings using a dictionary:
>
>>>> d = {'list':[0, 1]}
>>>> '%(list)s' % d
> '[0, 1]'
>
> Is it possible to reference an item in the list d['list']?:
>
>>>> '%(list[0])s' % d
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> KeyError: 'list[0]'
No, but you can provide a modified dictionary to get the effect:
>>> class Dict(dict):
... def __getitem__(self, key):
... if key in self:
... return super(Dict, self).__getitem__(key)
... return eval(key, self)
...
>>> d = Dict(list=[0, 1])
>>> "%(list)s" % d
'[0, 1]'
>>> "%(list[0])s" % d
'0'
>>> "%(list[1]+42)s" % d
'43'
Peter
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