Are lists at least as efficient as dictionaries?

[Jp Calderone]

On Fri, Aug 29, 2003 at 10:24:37AM -0700, Chad Netzer wrote:
> On Fri, 2003-08-29 at 07:54, Jp Calderone wrote:
> 
> >   += could simply be syntactic sugar for a call to __add__ and then an
> > assignment.  This would work for mutable and immutable objects.
> 
> But it loses the advantage that some objects would otherwise have of
> being able to mutate in place, without allocating a new object (ie. very
> large matrix additions).
> 

  But as you removed from my original post, list.extend() exists.  All one
has to do to retain the existing functionality of __iadd__ is name the
method something else, then call it.  All the advantages, none of the
confusing or difficult to track semantics.

  Jp