New submission from Adam Meily <meily.a...@gmail.com>:
I upgraded from Python 3.7.1 to 3.7.6 and began noticing a behavior that was breaking my code. My code detects if it's running in a virtualenv. This check worked in 3.7.1 but is broken in 3.7.6. >From the documentation, sys.prefix and sys.exec_prefix should point to the >virtualenv when one is active. However, I'm seeing that both of these >constants are pointing to the system installation directory and not my >virtualenv when I am in a multiprocessing child. Here is an example output of >a test application running in 3.7.6 (I've attached the test script to this >ticket): Parent process ============================================= sys.prefix: C:\Users\user\project\venv sys.exec_prefix: C:\Users\user\project\venv sys.base_prefix: C:\Program Files\Python37 sys.base_exec_prefix: C:\Program Files\Python37 ============================================= Subprocess ============================================= sys.prefix: C:\Program Files\Python37 sys.exec_prefix: C:\Program Files\Python37 sys.base_prefix: C:\Program Files\Python37 sys.base_exec_prefix: C:\Program Files\Python37 ============================================= I would expect that sys.prefix and sys.exec_prefix to be identical in the parent and child process. I verified that this behavior is present in 3.7.5, 3.7.6, and 3.8.1. I am on a Windows 10 x64 system. Python 3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 23:11:46) [MSC v.1916 64 bit (AMD64)] on win32 ---------- components: Windows files: multiproc_venv_prefix.py messages: 360581 nosy: meilyadam, paul.moore, steve.dower, tim.golden, zach.ware priority: normal severity: normal status: open title: Windows Multiprocessing in Virtualenv: sys.prefix is incorrect versions: Python 3.7, Python 3.8 Added file: https://bugs.python.org/file48862/multiproc_venv_prefix.py _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39439> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
