[issue39225] Python should warn when a global/local has the same name as a builtin
New submission from Reuven Lerner : Newcomers to Python are often frustrated and surprised when they define variables such as "sum" and "list", only to discover that they've masked access builtins of the same name. External code checkers do help, but those don't work in Jupyter or other non-IDE environments. It would be nice if defining a global/local with the same name as a builtin would generate a warning. For example: list = [10, 20, 30] RedefinedBuiltinWarning: "list" is a builtin, and should normally not be redefined. I'm sure that the wording could use a lot of work, but something like this would do wonders to help newbies, who encounter this all the time. Experienced developers are surprised that these terms aren't reserved words. -- components: Interpreter Core messages: 359384 nosy: reuven priority: normal severity: normal status: open title: Python should warn when a global/local has the same name as a builtin ___ Python tracker <https://bugs.python.org/issue39225> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42469] Space in re's {min, max} should raise an error, rather than fail silently
New submission from Reuven Lerner :
I just discovered that having whitespace inside of {min,max} causes the regexp
to report no matches, rather than an error:
>>> import re
>>> s = 'abbccce'
>>> re.findall('d{1, 4}', s)
[]
>>> re.findall('d{1,4}', s)
['']
Ruby and JavaScript have the same behavior, so maybe this is standard in some
way. But I find it hard to believe that it's desirable. (My post on Twitter
about this confirmed that a whole lot of people were bitten by this bug in the
past.)
BSD grep, GNU grep, and GNU Emacs all raise an error upon encountering this
whitespace, which strikes me as less surprising and more useful behavior.
--
components: Regular Expressions
messages: 381879
nosy: ezio.melotti, mrabarnett, reuven
priority: normal
severity: normal
status: open
title: Space in re's {min,max} should raise an error, rather than fail silently
versions: Python 3.9
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