referring from within containers objects

[Sandy Norton]

Hi,

This is just an idea that occurred to me while working with
dictionaries in which the values of certain keys were composed of the
values of other keys and I found that the syntax for solving that
problem wasn't as pretty as I would have liked. 

Here's an example:

d = {
  'fname' : 'Nit',
  'lname' : 'Wit'
}

Now I have to do this:

d['fullname'] = d['fname'] + ' ' + d['lname']

if I want to reuse the keys/values within the dict. This forces me to
break out of the dictionary definition, which I don't like doing for
some reason.

Now what if I could do something like this: 

d2 = {
    'fname' : 'Nit',
    'lname' : 'Wit',
    'fullname' : _['fname'] + ' ' + _['lname']
}   

where '_' refers to the containing dict.

This can be extended to lists:

lst = [ 'Nit', 'Wit', _[0] + ' ' + _[1] ]


Sandy