[issue43151] is with literals in 3.8 release
New submission from Gary Litvin : >>> x = 'a' >>> x is 'a' True >>> if x is 'a': print(x) SyntaxError: "is" with a literal. Did you mean "=="? How come? -- messages: 386575 nosy: garylitvin priority: normal severity: normal status: open title: is with literals in 3.8 release versions: Python 3.8, Python 3.9 ___ Python tracker <https://bugs.python.org/issue43151> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43151] is with literals in 3.8 release
Gary Litvin added the comment: Thank you for your responses. I understand the difference between == and "is" and the intentional change in 3.8. My question is about what seems to be inconsistent treatment in x is 'a' and if a is 'a': ... At 12:49 AM 2/7/2021, Raymond Hettinger wrote: >Raymond Hettinger added the comment: > >As Dennis says, this is an intentional behavior and will help you avoid bugs. > >-- >nosy: +rhettinger >resolution: -> not a bug >stage: -> resolved >status: open -> closed > >___ >Python tracker ><https://bugs.python.org/issue43151> >___ -- ___ Python tracker <https://bugs.python.org/issue43151> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43151] is with literals in 3.8 release
Gary Litvin added the comment: I noticed it in IDLE 3.8. I installed 3.8 because it is a fairly recent release described as "stable." Thanks to everyone for considering this. At 03:41 AM 2/7/2021, you wrote: >Dennis Sweeney added the comment: > >I think the strangeness is happening because sometimes, the warning >is printed to stderr, while other times, IDLE's parser notices the >"is " anti-pattern and raises a SyntaxError. > >See the attached screenshot for the IDLE output versus the console >output for a recent 3.10 build. > >-- >Added file: https://bugs.python.org/file49796/idle_stderr.jpg > >___ >Python tracker ><https://bugs.python.org/issue43151> >___ -- ___ Python tracker <https://bugs.python.org/issue43151> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
