[New-bugs-announce] [issue43195] Same userbase for 32bit and 64bit install on Windows causing conflicts

[Christoph Reiter]

New submission from Christoph Reiter <reiter.christoph at gmail.com>:

I'm sure this is already filed somewhere, but I couldn't find anything.

Currently when installing packages with pip using a 64bit Python to --user and then starting a 32bit Python things fail because they look up packages from the same location:

.\python.exe -m site --user-base
C:\Users\user\AppData\Roaming\Python

For example trying to import numpy from a 32bit Python when it was installed with 64bit:

>>> import numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\user\AppData\Roaming\Python\Python39\site-packages\numpy\__init__.py", line 143, in <module>
    from . import _distributor_init
  File "C:\Users\user\AppData\Roaming\Python\Python39\site-packages\numpy\_distributor_init.py", line 26, in <module>
    WinDLL(os.path.abspath(filename))
  File "C:\Python39-32\lib\ctypes\__init__.py", line 374, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 193] %1 is not a valid Win32 application

I guess this isn't a very common problem, but in MSYS2 we are facing this issue because users can easily switch between 32bit/64bit Python. We could patch things, but I'm wondering if there are any plans to fix this in CPython itself so we don't invent our own thing.

thanks

----------
components: Windows
messages: 386804
nosy: lazka, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Same userbase for 32bit and 64bit install on Windows causing conflicts
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43195>
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