New submission from Nick Coghlan: In just the last 24 hours, I've run across two cases where the default "the script directory is on sys.path" behaviour confused even experienced programmers:
1. a GitHub engineer thought the Python version in their Git-for-Windows bundle was broken because "from random import randint" failed (from a script called "random.py" 2. a Red Hat engineer was thoroughly confused when their systemd.py script was executed a second time when an unhandled exception was raised (Fedora's system Python is integrated with the ABRT crash reporter, and the except hook implementation does "from systemd import journal" while dealing with an unhandled exception) This isn't a new problem, we've known for a long time that people are regularly confused by this, and it earned a mention as one of my "Traps for the Unwary in Python's Import System": http://python-notes.curiousefficiency.org/en/latest/python_concepts/import_traps.html#the-name-shadowing-trap However, what's changed is that for the first time I think I see a potential way out of this: rather than injecting the script directory as sys.path[0], we could set it as "__main__.__path__ = [<the-script-dir>]". Cross-version compatible code would then be written as: if "__path__" in globals(): from . import relative_module_name else: import relative_module_name This approach would effectively be a continuation of PEP 328 (which eliminated implicit relative imports from within packages) and PEP 366 (which allowed implicit relative imports from modules executed with the '-m' switch). ---------- components: Interpreter Core messages: 290689 nosy: ncoghlan priority: normal severity: normal status: open title: Idea: Make __main__ an implied package type: enhancement versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29929> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
