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Like Joseph said, there is an error in the first parameter of QgsRasterCalculator. But it must be string, unlike Josephs suggestion. So i tried this: calc=QgsRasterCalculator ('%s - %s'%(target.ref, …

The sql-parameter is not what it sounds like. It only takes a where-clause, like 'id = 20' in your case. So try: uri.setDataSource("public","table", "the_geom", 'id = 20',"gid")

You can register/load and run a plugin like this: import sys sys.path = ["your/path/aboveMyPlugin"] + sys.path import MyPlugin plugin = MyPlugin.classFactory(iface) plugin.initGui() plugin.run() My …

not fulfill the requirements of a plugin, which has the structure of a python package, which means it consists of a folder whith file init.py, a function named classFactory and more, described in the pyqgis …

For QGIS3 we need a special environment, that differs from the QGIS2-Versions. Because not only Python changed to python3 but also pyqt5/Qt5 need different settings. To work with a complete environme …

Barry Rowlingson build an plugin for QGIS2 called "Rasterlang" (https://www.maths.lancs.ac.uk/~rowlings/Software/Qgis/Plugins/rasterlang/), inside there is a modul named layers.py with a function call …

This works for me: if iface.mapCanvas().isCachingEnabled(): lyr.triggerRepaint() else: iface.mapCanvas().refresh()

from PyQt5.QtWidgets import QInputDialog def getTextInput(title, message): answer = QInputDialog.getText(None, title, message) if answer[1]: print(answer[0]) return answer[0] …

In my comment I mentioned two different possibilities to include additional python modules with a QGIS python plugin. Regarding how and where a plugin is installed, it is not comfortable or even possi …

I'm using a batchfile to set the environment for python and qgis, like this: SET QGIS_PREFIX_PATH=%OSGEO4W_ROOT:\=/%/apps/qgis SET PYTHONPATH=%OSGEO4W_ROOT%\apps\qgis\python SET PYTHONHOME=%OSGEO4W_R …

You don't need the sql parameter! In particular, it only takes the where clause, so the name sql is misleading. See Adding PostGIS layer from QGIS Python plugin for a simple example. supplement: if …

If the problem is to load a plugin inside qgis python console, you may check this code: import qgsAffine # or another plugin modul plugin = qgsAffine.classFactory(iface) # standard interface for regi …

I tried for long and found the following points are important Always use the OSGEO4W-Shell to execute an osgeo-program, don't use cmd.exe directly. (The shell executes all batch files in %OSGEO4W_RO …

I broke it down to a simple example. Here, at least one vector layer must be loaded in QGIS and it must be the top one. Then you can execute this in the python console as a script: from PyQt5.QtWidge …

Second, a standalone pyqgis script has to "prepare" or init a pyqgis app, analog to a qt5 app. … There is a description for writing standalone scripts in the pyqgis developer cookbook And finally call that script through the batch file created in the first step. …