> On 25 Nov 2021, at 13:06, ehmatt...@gmail.com wrote: > > Hi everyone, > > I've been really impressed by the recent improvements to error messages in > Python 3.10. The specific suggestions in some error messages are going to > save countless hours of people's time. The benefits for beginners are fairly > obvious. But even for experienced programmers, the difference between seeing > a missing colon in an error message and just adding it where it should have > been vs spending 30 seconds or a minute figuring out what's missing at the > start of a loop adds up. > > One common error that I haven't seen discussed is bare logical comparisons. > They're syntactically legal so they don't raise errors, but I have never seen > a real-world use case for one. Here's the simplest example I can come up with: > > name = 'eric' > print(name) > > name == 'ever'
The __eq__ method is run which might have side effects. Which may mean raising error may be a backwards compat issue, Maybe it is a problem for linters to report as a problem. I have not checked if they already do. > print(name) > > We want to assign a new value to an existing variable, but we accidentally > type a second equals sign. The output here makes the mistake fairly obvious, > but in longer programs it can take a while to spot this issue. > > I know there are some editors and linters that flag this. Is there any reason > not to raise a warning or even an error at the language level? Is there any > reason to use a bare logical comparison in real-world code? > _______________________________________________ > 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/4QVUWND6FFDWCD3DL3BR3763EQRAAI5D/ > Code of Conduct: http://python.org/psf/codeofconduct/ > _______________________________________________ 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/VTEHJONXDAV3SX2IOCIOM3Q43J3SRCQ7/ Code of Conduct: http://python.org/psf/codeofconduct/
