Python: how to deal with several .pyd dependencies with the same name?
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10-03-2021 - |
Question
I have in my python workspace two Modules which need sip.pyd
Module1.pyd needs sip.pyd (which implements v 8.0-8.1)
Module2.pyd needs sip.pyd (another file, that implements v6.0)
So I can't just choose the newer one, it doesn't work: I have to keep them both!
(RuntimeError: the sip module implements API v6.0 but the fbx module requires API v8.1)
How can I import a module in .pyd extension (a python dll, not editable), and specify which sip.pyd to source?
As for a workaround, I manage to do that:
- One sip.pyd is in my root site-packages location.
- If I have to import the module that need the other sip.pyd, I remove root path form sys.path, and I append the precise folder path where the other sip.pyd are.
- I can import my Module and restore previous sys.path.
Solution
Assuming you don't have a piece of code needing both files at once. I'd recommend the following:
install both files in 2 separate directories (call them e.g.
sip-6.0
andsip-8.0
), that you'll place insite-packages/
write a
sip_helper.py
file with code looking like
sip_helper.py contents:
import sys
import re
from os.path import join, dirname
def install_sip(version='6.0'):
assert version in ('6.0', '8.0'), "unsupported version"
keep = []
if 'sip' in sys.modules:
del sys.modules['sip']
for path in sys.path:
if not re.match('.*sip\d\.\d', path):
keep.append(path)
sys.path[:] = keep # remove other paths
sys.path.append(join(dirname(__file__), 'sip-%s' % version))
- put sip_helper.py in site_packages (the parent directory of the sip-6.0 and sip-8.0 directories)
- call
sip_helper.install_sip
at the startup of your programs
OTHER TIPS
VirtualEnv is done to handle those case.
virtualenv is a tool to create isolated Python environments.
Using virtualenv, you will be able to create 2 environements, one with the sip.pyd in version 8.x another in version 6.0
I don't know if that works (if a module's name has to match its contents), but can't you just rename them to sip6.pyd
resp. sip8.pyd
and then do
if need6:
import sip6 as sip
else:
import sip8 as sip
?