Pytest: disable the creation of the __pycache__ directory
All 10 comments
_Original comment by_ Benjamin Peterson (BitBucket: gutworth, GitHub: gutworth):
You can run python with -B or set PYTHONDONTWRITEBYTECODE=1.
pytestbot
on 9 Oct 2012
Where do we set PYTHONDONTWRITEBYTECODE=1.?
SharanyaVR
on 2 Sep 2017
Anywhere in your environment, .bashrc for example.
nicoddemus
on 2 Sep 2017
Hello everyone, I have the same problem with creation of __pycache__ I added PYTHONDONTWRITEBYTECODE=1 in my /etc/environment but it still creates. Is there other way? thanks!
clorieanne
on 7 Jun 2018
Hi @clorieanne,
Not sure, pytest certainly respects that:
Also I just tested this and setting the PYTHONDONTWRITEBYTECODE=1 correctly prevents pytest from writing the __pycache__ folder.
Perhaps is some other library creating the folder?
nicoddemus
on 7 Jun 2018
In order to prevent both ./.pytest_cache _and_ ./**/__pycache__ from being generated.
The only thing that worked for me was using both the above solution _as well as_ disabling caching
PYTHONDONTWRITEBYTECODE=1 python -m pytest -p no:cacheprovider
(source)
As far as I can tell, the above command does not generate any artifacts. IMHO no:cacheprovider should be the default. If users want performance enhancements they should have to explicitly specify that.
golubitsky
on 8 Jun 2018
@golubitsky indeed .pytest_cache is created regardless... we should think how better support running pytest on readonly file systems.
FWIW cacheprovider is not about performance, but to persist data between test sessions, and provides --lf and --ff flags. And sorry, but performance enhancements should be enabled by default if that were the case, as many other things in Python are. For example you get accelerator modules when importing some builtin modules (like pickle) automatically by default.
nicoddemus
on 9 Jun 2018
Opened #3557 as followup.
nicoddemus
on 9 Jun 2018
Hello, everyone
I have the same problem when I build Python package by setup.py, and how do I package and install the Python package without creating __pycache__ directory.
Thanks!
xuguozhen
on 30 May 2020
@SharanyaVR You need to export the PYTHONDONTWRITEBYTECODE variable, not enough to only create it in the current shell.
token47
on 19 Aug 2020
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Most helpful comment
In order to prevent both
./.pytest_cache_and_./**/__pycache__from being generated.The only thing that worked for me was using both the above solution _as well as_ disabling caching
(source)
As far as I can tell, the above command does not generate any artifacts. IMHO
no:cacheprovidershould be the default. If users want performance enhancements they should have to explicitly specify that.