Everyone in this thread should absolutely read Lewis Caroll's delightful and "What the Tortoise Said to Achilles." It's a very short 3-page story that addressed exactly this topic in 1895... even before Guido's Time Machine.
One free copy of the public domain work is at: https://wmpeople.wm.edu/asset/index/cvance/Carroll On Sun, Aug 22, 2021 at 8:30 PM Steven D'Aprano <st...@pearwood.info> wrote: > On Sun, Aug 22, 2021 at 07:01:28PM +0300, Serhiy Storchaka wrote: > > > (len(collection) == 0) is True > > Ha ha, yes, very good, you got me. But the trouble is, if you don't > trust the truth value of the predicate, it is hard to know when to > stop: > > len(collection) == 0 > (len(collection) == 0) is True > ((len(collection) == 0) is True) is True > (((len(collection) == 0) is True) is True) is True > ((((len(collection) == 0) is True) is True)) is True > # ... > > *wink* > > MRAB and Ricky: > > `__builtins__` is a CPython implementation detail and is reserved for > the interpreter's private use. Other implementations may not even have > it. The right way to write your code should be > > import builtins > builtins.bool((builtins.len(collection) == 0) is True) is True > > > -- > Steve > _______________________________________________ > 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/NNMPGIHGEKCNPHR5OBXE4BXW3LMJ77HN/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Keeping medicines from the bloodstreams of the sick; food from the bellies of the hungry; books from the hands of the uneducated; technology from the underdeveloped; and putting advocates of freedom in prisons. Intellectual property is to the 21st century what the slave trade was to the 16th.
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