I use PyCharm CE 2020.3.3 (also tested with 2020.2.5) and just upgraded QGIS to the new version 3.18 (first version with Python 3.9). When I updated my start script for PyCharm and updated the Python interpreter in PyCharm, the program recognises some parts of the API, but not all:
It seems that it's only finding those classes that are directly defined in the init.py of the qgis.core module.
Is that a QGIS bug or a PyCharm bug or related to how I loaded PyQGIS into PyCharm? This is my start script:
@echo off
call C:\OSGeo4W64\bin\o4w_env.bat
call "%OSGEO4W_ROOT%\apps\grass\grass78\etc\env.bat"
@echo off
path %PATH%;%OSGEO4W_ROOT%\apps\qgis\bin
path %PATH%;%OSGEO4W_ROOT%\apps\grass\grass78\lib
path %PATH%;%OSGEO4W_ROOT%\apps\Qt5\bin
path %PATH%;%OSGEO4W_ROOT%\apps\Python39\Scripts
set PYTHONPATH=%PYTHONPATH%;%OSGEO4W_ROOT%\apps\qgis\python
set PYTHONPATH=%PYTHONPATH%;C:\Users\jludwig\PycharmProjects\QGIS-LRS-Rail;%OSGEO4W_ROOT%\apps\Python39\Scripts
set QGIS_PLUGINPATH=%QGIS_PLUGINPATH%;C:\Users\jludwig\PycharmProjects\QGIS-LRS-Rail;%OSGEO4W_ROOT%\apps\qgis\python\plugins
set PYTHONPATH=%PYTHONPATH%;%QGIS_PLUGINPATH%
set PYTHONHOME=%OSGEO4W_ROOT%\apps\Python39
path %PATH%;C:\Program Files\Git\bin
start "PyCharm aware of QGIS 3" /B "C:\Program Files\JetBrains\PyCharm Community Edition 2020.2.5\bin\pycharm64.exe" %*
And this is the list of paths known to the Python interpreter:
