Message 386622 - Python tracker

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Author	terry.reedy
Recipients	cheryl.sabella, miss-islington, rhettinger, serhiy.storchaka, taleinat, terry.reedy
Date	2021-02-08.08:38:44
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1612773525.69.0.16663742445.issue37824@roundup.psfhosted.org>
In-reply-to

Content
#43151 asked about 'is <literal>' syntax warnings in REPL. Discussion noted that IDLE Shell does note print it for "x is 'a'" (known here) and that for "if x is 'a': print('executed')" there is a syntax error and no execution. The conversion to SyntaxError was supposedly fixed by PR-15500, but it appears that the patch for #40807 introduced it into codeop._maybe_compile. msg386621 has summary and discussion. I need to add debug prints or breakpoints into _maybe_compile to understand it better, and maybe improve it. Before printing syntax warnings in Shell, I want to stop expanding them from 1 to 4 lines. We could just not import the replacement from run.py, but I think the default format could be improved even with 1 or 2 lines.

#43151 asked about 'is <literal>' syntax warnings in REPL.  Discussion noted that IDLE Shell does note print it for "x is 'a'" (known here) and that for "if x is 'a': print('executed')" there is a syntax error and no execution.  The conversion to SyntaxError was supposedly fixed by PR-15500, but it appears that the patch for #40807 introduced it into codeop._maybe_compile.

msg386621 has summary and discussion.  I need to add debug prints or breakpoints into _maybe_compile to understand it better, and maybe improve it.

Before printing syntax warnings in Shell, I want to stop expanding them from 1 to 4 lines.  We could just not import the replacement from run.py, but I think the default format could be improved even with 1 or 2 lines.

History
Date	User	Action	Args
2021-02-08 08:38:45	terry.reedy	set	recipients: + terry.reedy, rhettinger, taleinat, serhiy.storchaka, cheryl.sabella, miss-islington
2021-02-08 08:38:45	terry.reedy	set	messageid: <1612773525.69.0.16663742445.issue37824@roundup.psfhosted.org>
2021-02-08 08:38:44	terry.reedy	link	issue37824 messages
2021-02-08 08:38:44	terry.reedy	create