[Python-3000] PEP 3113 (Removal of Tuple Parameter Unpacking)
Ka-Ping Yee
python at zesty.ca
Mon Mar 5 09:42:27 CET 2007
On 3/4/07, Raymond Hettinger <python at rcn.com> wrote:
> FWIW, I would like the feature to be kept. I've found it useful in that it
> documents the function signature more completely when dealing
> with arguments that are already pre-packed into tuples
I just noticed that this has a more noticeable effect on lambda, since
you don't have room for another statement to do the unpacking.
To sort a dictionary by value, you can currently write
sorted(dict.items(), key=lambda (key, value): value)
Without tuple unpacking, this idiom becomes
sorted(dict.items(), key=lambda item: item[1])
obscuring the fact that the item is a (key, value) pair.
-- ?!ng
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