New submission from Mitchell Hentges <mitch9...@gmail.com>:
Python 3 imports may fail if a Python 2 .pyc file exists without an accompanying .py file. ----- My project vendors code, and we recently updated "requests" to a drastically newer version. As part of this version change, `requests/packages/__init__.py` was removed, and `requests/packages.py` was added. This project is long-lived, and many people have imported `requests` with Python 2. So, `requests/packages/__init__.pyc` exists. After making this update, importing requests with Python 3 fails: `ImportError: bad magic number in 'parent.child': b'\x03\xf3\r\n'` Interestingly, deleting `requests/packages/__init__.pyc` allows Python 3 to work again. ----- I've attached a "reproduction" script that produces the directory structure and tweak required to cause the failure. I'm running Python 2.7.18 and Python 3.9.1. ---------- components: Interpreter Core files: repro.sh messages: 392254 nosy: mitchhentges priority: normal severity: normal status: open title: "bad magic number" when Python 2's pyc file exists without py file type: behavior versions: Python 3.6, Python 3.7, Python 3.8, Python 3.9 Added file: https://bugs.python.org/file49997/repro.sh _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue43969> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
