DLL import error when installing psutil in custom directory and then importing.

[mai1x9]

Summary

• OS: WIndows
• Psutil version: 5.9.4
• Python version: 3.8.8
• Type: Installation and importing, dll error.

Description

I have installed psutil in directory third_party, using

pip install psutil -t ./third_party

And from test.py which is outside third_party directory, I have imported as shown below by adding third_party to sys path.

import sys
import os
sys.path.append(os.path.join(os.path.dirname(__file__), "third_party" ))
import psutil.

and it throws the error.

Traceback (most recent call last):
  File ".\libtest.py", line 9, in <module>
    import psutil
  File ".\third_party\psutil\__init__.py", line 109, in <module>
    from . import _pswindows as _psplatform
  File ".\third_party\psutil\_pswindows.py", line 35, in <module>
    from ._psutil_windows import ABOVE_NORMAL_PRIORITY_CLASS
ImportError: DLL load failed while importing _psutil_windows: The parameter is incorrect.

All other python libraries which does not have dll and saved in third_party has worked.

However, below code works,

import third_party.psutil

Why does import psutil not working even though third_party library is in sys path. Am i missing something related to loading of Dll ?

[JeromeBriot]

I was facing the same issue.

• OS: WIndows
• Psutil version: 5.9.5
• Python version: 3.9.6

The only solution I found was to downgrade to version 5.9.3

python -m pip install psutil==5.9.3