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Fri Apr 29 16:43:16 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-April/111127.html

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.

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

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