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

29 Apr 2011


      Hi! Seems like a question for python-ideas mailing list, not for python-dev.

On Fri, Apr 29, 2011 at 10:27:46AM -0400, Roy Hyunjin Han 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?
::
# Current behavior
    x = {'key1': 1}
    x.update(key1=3) == None
    x == {'key1': 3} # Original variable has changed
# Possible behavior
    x = {'key1': 1}
    x.replace(key1=3) == {'key1': 3}
    x == {'key1': 1} # Original variable is unchanged
You can implement this in your own subclass of dict, no?

Oleg.
-- 
     Oleg Broytman            http://phdru.name/            phd@phdru.name
           Programmers don't die, they just GOSUB without RETURN.