[Linux] error with import psutil

[Wissperwind]

Hi,

I try to ship my software with an included 3rd party folder. I includes psutil.
In most cases I can just launch the application. But at one linux server I can't.
I get this error message:

test@plmlnx10:/opt/globalx> python3
Python 3.6.12 (default, Dec 02 2020, 09:44:23) [GCC] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import psutil
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/test/psbp/resource/3rdpty/psutil/__init__.py", line 99, in <module>
    from . import _pslinux as _psplatform
  File "/opt/test/psbp/resource/3rdpty/psutil/_pslinux.py", line 26, in <module>
    from . import _psutil_linux as cext
ImportError: cannot import name '_psutil_linux'
>>>

What is the problem?

[Wissperwind]

I can't ask customers to install or reinstall psutil with pip. I need to send a folder.

[giampaolo]

psutil needs to be built / installed, and that's because you need to compile 2 C extensions (on Linux):

build/lib.linux-x86_64-3.6/psutil/_psutil_linux.cpython-36m-x86_64-linux-gnu.so
build/lib.linux-x86_64-3.6/psutil/_psutil_posix.cpython-36m-x86_64-linux-gnu.so

You can try to build psutil on your linux system (python3 setup.py build) and manually copy those 2 files (plus all *.py files) into user's python site-package directory, but it's an hack. The user will need to have the same architecture and possibly (but am not sure) also the same Python version.

[Wissperwind]

ok, which setup.py file do you mean?
Is there a better way? Like including the wheels and trying to do an offline installation?

[giampaolo]

ok, which setup.py file do you mean?

https://github.com/giampaolo/psutil/blob/master/setup.py

Is there a better way? Like including the wheels and trying to do an offline installation?

I don't know.

[Wissperwind]

Ok, one thing I don't understand:
If I run pip download -r requirements.txt with only psutil in the requirements.txt file, it downloads a whl. And that whl does not contain a setup.py file. How is setup.py executed during pip installation? Or is it not executed?

[giampaolo]

Wheels are pre-compiled binaries. You can only install them with pip. setup.py is not executed.

[Wissperwind]

ok, so maybe I can either merge all wheels, or include the wheels in my distribution and install the suitable one offline with pip.
I'll try.