Addressing the last element of a list

Peter Otten __peter__ at web.de
Thu Nov 10 16:42:22 CET 2005


Antoon Pardon wrote:

> Write somekind of property so that if you manipulate a.x it would
> manipulate data[-1]

Like that?

>>> def make_prp(index):
...     def get(self): return self[index]
...     def set(self, value): self[index] = value
...     return property(get, set)
...
>>> class List(list):
...     first = make_prp(0)
...     last = make_prp(-1)
...
>>> items = List([1,2,3])
>>> items.first
1
>>> items.last = 42
>>> items
[1, 2, 42]

However, that's customizing attribute access, not name binding.

Peter




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