New submission from Bryan G. Olson: Python 3.3 includes PEP 397, a Python launcher for Windows, and PEP 405, virtual environment support in core. Unfortunately the Windows launcher does not respect virtual environments. Even with with a virtual environment activated and the current directory at the virtual environment's root, the Windows launcher will start python with the system environment, not the active virtual environment.
To demo: Install python 3.3 for windows. Create a virtual environment: C:\>c:\Python33\Tools\Scripts\pyvenv.py c:\virtpy Activate the virtual environment: C:\>virtpy\Scripts\activate.bat (virtpy) C:\> Optionally cd to the virtual environment: (virtpy) C:\>cd virtpy (virtpy) C:\virtpy> Start Python 3 with the new windows launcher: (virtpy) C:\virtpy>py -3 Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> Check sys.path >>> import sys >>> >>> sys.path ['', 'C:\\Windows\\system32\\python33.zip', 'C:\\bin\\Python33\\DLLs', 'C:\\bin\\Python33\\lib', 'C:\\bin\\Python33', 'C:\\bin\\Python33\\lib\\site-packages'] >>> The worst effect I've found is that installation of a package with windows launcher, "py -3 setup.py install", will ignore the active virtual environment and will change the system Python environment. That's bad because users frequently employ virtual environments to isolate changes that could damage a system configuration. ---------- components: Installation, Windows messages: 180362 nosy: bryangeneolson priority: normal severity: normal status: open title: Windows launcher ignores active virtual environment type: behavior versions: Python 3.3 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17010> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
