that's what I assumed... thanks for the reply! :) On Tue, Mar 31, 2020 at 9:08 PM Serhiy Storchaka <storch...@gmail.com> wrote:
> 31.03.20 20:15, Nadav Wexler пише: > > Hi, > > That is my first post here, I hope it's the right place for it. > > > > so I was using some dicts had the following code: > > env = dict(t for t in os.environ.items() if 'SUBSTRING' not in > > t[0]) > > > > and I thought: It could have really been nice if i could do: > > env = dict(t for t in os.environ.items() if 'SUBSTRING' not in > > t.key) > > > > now I see that environ is not exactly a dict, but i think this is useful > > for all dictionary types. on the other hand, dicts are everywhere and > > i'm not sure about the performance impact of this for those that just > > ignore the access by attribute. > > > > of course, a matching t.value must be in place as well. ;) > > I would have opened a PR just to try out, but I feel this is so in the > > core that I'd first like to hear some comments. > > I was searching if anyone else had this idea before but couldn't find > > anything. > > This idea was proposed multiple times and was rejected. Python is > optimized for raw tuples, it is one of most important type. Many > operations with tuples are much faster than operations with named tuples > (including creating and destroying). Tuples emitted by dict.item() (an > enumerate(), and zip()) are usually short-living and produced in mass. > So replacing tuples with named tuples would harm a lot of code which do > not need attribute access. > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/VRVLQHMKFMVEC4T7VN5QEVSFGPEZWG7P/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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