[vim/vim] Vim embedded Python doesn't honor PYTHONDONTWRITEBYTECODE (#3494)
DervishD
Hi there!
Vim 8.1.332 x64 under Windows 10, Python 3 with dynamic linking.
Looks like at least with this combination, Vim plugins containing Python code generate __pycache__ directories full of .pyc files. Not a life-or-death situation, but I have PYTHONDONTWRITEBYTECODE enabled in my system (as a system environment variable, my installed Python works) and I'd love Vim to honor this ;)
Looks like Vim is not providing the correct environment when loading the Python DLL, or maybe under Windows this is entirely impossible, or maybe Python doesn't even honor the environment variable when used through the DLL, but I thought that since Vim has been the first program showing the issue maybe reporting here is the proper way of starting.
Thanks a lot in advance. I'm including the output of the :version command just in case. Feel free to ask me for any other information you may need, and thanks!!!!
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Tony Mechelynck
Hm... I am on Linux, where it seems that shells loaded from Vim don't source the same startup scripts as when they are loaded from login.
Maybe you could just add to your vimrc the line
let $PYTHONDONTWRITEBYTECODE = "1"
or something similar? Maybe (or maybe not) bracketed by if has('python') || has('python3')?
Best regards,
Tony.
DervishD
Hi Tony! Long time no see!!!! I'm very happy to read you again, amiko mia!
Maybe you could just add to your vimrc the line
let $PYTHONDONTWRITEBYTECODE = "1"or something similar? Maybe (or maybe not) bracketed by
if has('python') || has('python3')?
Already tried this, to no avail. Looks like as soon as jedi-vim is loaded, the cache is recreated. No biggie, really, but I wondered why it happened. I'll try to investigate the issue more.
Thanks anyway!!!
Really, I'm happy you are still on the Vim trenches, helping :)
micbou
Looks like Python 3 in Vim does not honor the PYTHONDONTWRITEBYTECODE environment variable on Windows. Python 2 does not suffer from the issue. A workaround is to set sys.dont_write_bytecode to True in vimrc:
py3 sys.dont_write_bytecode = True
DervishD
I'll try that, @micbou , thanks for the suggestions. But the code should be like
py3 import sys; sys.dont_write_bytecode=True
right?
And it worked! I just tested it and it seems that Python 3 under Vim honors this setting. That's great, thanks a lot for the suggestion!
micbou
sys is already imported by Vim so the import statement is not needed (though it doesn't hurt to import it again).
DervishD
@micbou I didn't know sys was already imported by Vim, thanks a lot!!!
Obviously importing it again is not a big deal, but it's slower than not doing it, so I'll remove the import from my .vimrc. Thanks again 👍 :)
Christian Brabandt
Closed #3494.