AttributeError: module 'psutil_linux' has no attribute '__file__'

[thijstriemstra]

#564 adds detection for version mismatches, like the code below.

I've modified this code to print out some debug info:

# Sanity check in case the user messed up with psutil installation
# or did something weird with sys.path. In this case we might end
# up importing a python module using a C extension module which
# was compiled for a different version of psutil.
# We want to prevent that by failing sooner rather than later.
# See: https://github.com/giampaolo/psutil/issues/564
if (int(__version__.replace('.', '')) !=
        getattr(_psplatform.cext, 'version', None)):
    print(__version__)
    print(int(__version__.replace('.', '')))
    print(getattr(_psplatform.cext, 'version', None))
    print(_psplatform.cext.__file__)
    msg = "version conflict: %r C extension module was built for another " \
          "version of psutil (different than %s)" % (_psplatform.cext.__file__,
                                                     __version__)
    raise ImportError(msg)

And that creates the following traceback:

Oct 31 21:26:34: File "bootstrap.py", line 969, in _find_and_load
Oct 31 21:26:34: File "bootstrap.py", line 958, in _find_and_load_unlocked
Oct 31 21:26:34: File "bootstrap.py", line 664, in _load_unlocked
Oct 31 21:26:34: File "bootstrap.py", line 634, in _load_backward_compatible
Oct 31 21:26:34: File ":/psutil/__init__.py", line 208, in <module>
Oct 31 21:26:34: AttributeError: module 'psutil_linux' has no attribute '__file__'
Oct 31 21:26:34: 4.4.1
Oct 31 21:26:34: 441
Oct 31 21:26:34: 442

As you can see it detected a 4.4.1 python version and a 4.4.2 C-extension version (which is a mistake I corrected, I used old psutil files with a newer compiled 4.4.2 version of the c-extensions). It then tries to raise an ImportError that, in my case, raises an AttributeError itself because it cannot find _psplatform.cext.__file__.

My app compiles psutil using pyqtdeploy 1.3.1 and Python 3.5.2 that turns it into a native Qt application. This causes the __file__ attribute to be missing I suspect. Can we add a check for this attribute and ignore it when it doesn't exist?

[giampaolo]

This is weird. What psutil version are you using? The print(_psplatform.cext.__file__) line is not part of psutil source code.

[thijstriemstra]

@giampaolo no, I added those lines here to debug the problem. So these lines were added:

print(__version__)
print(int(__version__.replace('.', '')))
print(getattr(_psplatform.cext, 'version', None))
print(_psplatform.cext.__file__)

with only 3 results printed:

4.4.1
441
442

And that last print produces (print(_psplatform.cext.__file__)) an AttributeError to demonstrate the issue. Which otherwise would be produced in the statement after that:

msg = "version conflict: %r C extension module was built for another " \
          "version of psutil (different than %s)" % (_psplatform.cext.__file__,
                                                     __version__)

This is using 4.4.2 (+these prints). Hope that makes sense..

[giampaolo]

OK, I fixed this in 58c4b3d and I also provided a better error message printing both versions:

_ImportError: version conflict: '/home/giampaolo/svn/psutil/psutil/_psutil_linux.so' C extension module was built for another version of psutil (4.4.1 instead of 4.4.2); you may try to 'pip uninstall psutil', manually remove /home/giampaolo/svn/psutil/psutil/psutil_linux.so or clean the virtual env somehow, then reinstall

[thijstriemstra]

Awesome, thanks @giampaolo!