New submission from Juancarlo Añez <apal...@gmail.com>: The problematic `findall(...)[0]` is a common anti-pattern in Python programs. The reason is lack of symmetry and completeness in the `re` module.
The original proposal in `python-ideas` was to add `re.findfirst(pattern, string, flags=0, default=_mark)` with more or less the semantics of `next(findall(pattern, string, flags=flags), default=default)`. The referenced PR adds `findalliter(pattern, string, flags=0)` with the value semantics of `findall()` over a generator, implements `findall()` as `return list(findalliter(...))`, and implements `findfirst()`. Consistency and correctness are likely because all tests pass with the redefined `findall()`. ---------- components: Library (Lib) messages: 359039 nosy: apalala priority: normal pull_requests: 17191 severity: normal status: open title: Completeness and symmetry in RE, avoid `findall(...)[0]` type: enhancement versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39165> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
