> On 1 Dec 2021, at 12:01 PM, Chris Angelico <ros...@gmail.com> wrote: > > On Wed, Dec 1, 2021 at 6:43 PM Abdulla Al Kathiri > <alkathiri.abdu...@gmail.com> wrote: >>> On 1 Dec 2021, at 10:16 AM, Chris Angelico <ros...@gmail.com> wrote: >>> 3) If "yes" to question 1, would you use it for any/all of (a) mutable >>> defaults, (b) referencing things that might have changed, (c) >>> referencing other arguments, (d) something else? >> I will definitely use it for default mutable collections like list, set, >> dictionary etc. I will also use it to reference things that might have >> changed. For example, when making callbacks to GUI push buttons, I find >> myself at the start of the function/callback to be fetching the values from >> other widgets so we can do something with them. Now those values can be >> directly passed as late-bound defaults from their respective widgets (e.g., >> def callback(self, text1 => self.line_edit.text()): …). >>> > > Very interesting. That doesn't normally seem like a function default - > is the callback ever going to be passed two arguments (self and actual > text) such that the default would be ignored? Yeah. Let’s say the callback prints the text on the main window console. I could use the same function to print something on the console not related to the default widget changing text. Maybe another push button that prints literal “WOW”. If I made the second argument a default widget (def callback(self, line_edit=self.line_edit):...) and then call line_edit.text() inside the function, I would be able to pass any other widget that has the method text() but I wouldn’t be able to pass a literal text. > > But, hey, if it makes sense in your code to make it a parameter, sure! > >>> 5) Do you know how to compile CPython from source, and would you be >>> willing to try this out? Please? :) >> I haven’t done it from source. I might try to learn how to do it in the next >> weekend and give it a try. >> >>> I'd love to hear, also, from anyone's friends/family who know a bit of >>> Python but haven't been involved in this discussion. If late-bound >>> defaults "just make sense" to people, that would be highly >>> informative. >> I will show this to some of my coworkers who are python experts and I will >> report back. > > Thank you! All feedback greatly appreciated. > > Building CPython from source can be done by following these instructions: > > https://devguide.python.org/setup/ > > Instead of creating your own clone from the pristine master copy, > instead clone my repository at https://github.com/rosuav/cpython and > checkout the pep-671 branch. That'll give you my existing reference > implementation (it's pretty crummy but it mostly works). > > ChrisA > _______________________________________________ > 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/7VOA7BVTV5UJ24HOPMKO4XK6HW73DH5H/ > Code of Conduct: http://python.org/psf/codeofconduct/
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