[Python-Dev] What if replacing items in a dictionary returns the new dictionary?

[R. David Murray]

On Fri, 29 Apr 2011 10:27:46 -0400, Roy Hyunjin Han <starsareblueandfaraway at gmail.com> wrote:
> It would be convenient if replacing items in a dictionary returns the
> new dictionary, in a manner analogous to str.replace().  What do you
> think?

This belongs on python-ideas, but the short answer is no.  The
general language design principle (as I understand it) is that
mutable object do not return themselves upon mutation, while
immutable objects do return the new object.

--
R. David Murray           http://www.bitdance.com