Error "No module named PyQt5.QtCore" in QGIS standalone application

Question

import os, sys
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\qgis\python')
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\qgis\bin')
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\Python37')
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\Python37\Scripts')
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\Qt5\bin')
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\Python27\Scripts')
sys.path.append(r'C:\Program Files\QGIS 3.6\bin')
sys.path.append(r'C:\Windows\System32')
sys.path.append(r'C:\Windows')
sys.path.append(r'C:\Windows\System32\wbem')
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\Python37\Lib\site-packages\pywin32_system32')
sys.path.append(r'C:\Program Files\QGIS 3.6\apps\Python37\Lib\site-packages\numpy\.libs')
import qgis

I would like to write a standalone QGIS application. My Python file is on the desktop and I would like to access the QGIS functions. At the beginning I had the error import qgis module not found, which could be solved by the first line of sys.path.append. Now I get the error:

from PyQt5.QtCore import *
ModuleNotFoundError: No module named 'PyQt5.QtCore'

Although I have appended many different paths to the environment variables, I keep getting this error.

How do I solve this error and use the QGIS functions in a standalone application?

Error trying the anwser: Error

• menes: do you have the line from PyQt5.QtCore import * in your script or does import qgis raise the error?
• Moritz Sproll: the import qgis raises the error
• Germán Carrillo: Have you read this already? docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/…
• Moritz Sproll: yes I did this already and I am still getting the error.

Answer 1

You must be using different Python from the installed one by QGIS installation. When I try to run the script using a different Python interpreter (C:\Program Files\Python37\python.exe) not installed by QGIS I get the same error.

To be sure this is the reason:

• Add print("DONE!") after the line import qgis in your script above.

• Save the script as a Python file. (for example, test.py in C:\test folder)

• Open OSGeo Shell.

  enter image description here

• Run py3_env.

  enter image description here

• Run python c:\test\test.py.

You probably won't get error and it will print DONE!. That means you didn't use the Python interpreter installed by QGIS.

To solve this, either run the .py file in "OSGeo Shell" as mentioned above or set Python environment for the editor you use. For example, you have an option to select a Python interpreter in VSCode editor before running the file.

• Moritz Sproll: Yeah I know I did this already ! But for me its necessary to get QGIS running in a not QGIS-python-environment, because I want to transfer the standalone application to another computer.
• Moritz Sproll: Or can you help me writing a batch-file maybe to automatically open the OSGeo4W Shell and run this needed commands ? I just tried doing that, but failed again.
• Moritz Sproll: and I also get an error, when I try to do it like that, I added the error in my original question !
• Kadir Şahbaz: I don't encounter that error. I have no solution. You can check these search results. There are different solutions for that error in GIS.SE.
• Moritz Sproll: I already checked every page there :D I really dont know whats going wrong there