Bug report #20907

Cannot "from qgis.core import *" from Python script

Added by Luke R over 1 year ago. Updated over 1 year ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Python bindings / sipify
Affected QGIS version:3.4.3 Regression?:No
Operating System:Windows 10 Home Edition 64-bit Easy fix?:No
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:No Copied to github as #:28726

Description

While attempting to create a custom Python script for QGIS v3.4.3 (Madeira), I encountered the following Python error after running this command:

from qgis.core import *

Stack trace:
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    from qgis.core import *
  File "C:\Program Files\QGIS 3.4\apps\qgis\python\qgis\__init__.py", line 80, in <module>
    import qgis.gui
  File "C:\Program Files\QGIS 3.4\apps\qgis\python\qgis\gui\__init__.py", line 27, in <module>
    from qgis._gui import *
ValueError: PyCapsule_GetPointer called with incorrect name

Note: This particular trace was generated by IDLE (thus "<pyshell#0>" as the original file name).

Other instances of a similar error (involving `PyCapsule_GetPointer`) have been reported with PyQt in its own bug tracker.

Oddly enough, when this same command is run in the QGIS Python console, no errors are generated.

Also, this error came after the same import command was unable to find the PyQt5 module. This was resolved by `pip install`ing PyQt5, which I initially assumed that QGIS had already done.

History

#1 Updated by Jürgen Fischer over 1 year ago

  • Resolution set to invalid
  • Status changed from Open to Closed

You have to setup the environment (eg. by running "call py3_env.bat" and "call qt5_env.bat"; see also qgis.bat / python-qgis.bat).

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