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I'd like to use PyQGIS to run algorithms from the toolbox in QGIS 2.99 but runalg does not seem to be known. …

You can use the Reproject Layer algorithm from the processing toolbox. Let's assume you have a cities.shp in a folder named testing, and you want to create a new file cities_prj.shp that is transform …

Two steps: - add a line that indicates UTF-8 encoding to the top of your script - add the letter u (to indicate unicode) before the string that contains the umlaut For example, the following snippet: …

I am developing a plugin for QGIS 2.18 and I am sending queries to a layer: self.userLayer.startEditing() for feature in self.userLayer.getFeatures(): value = expression.evaluate(feature) fe …

You are calling the wrong class. What you need to call is mapCanvas, and not canvas. Change your code to this: allLayers = iface.mapCanvas().layers() for i in allLayers: print i.name() This wi …

I can open the console programmatically, using: qgis.utils.iface.actionShowPythonDialog().trigger() Is there a way to additionally open the console's editor (the window where you can enter multiple …

I am trying to create a memory layer: tempLayer = QgsVectorLayer('LineString', 'my_temp_layer', 'memory') But as soon as this line is excecuted (not when I add it to the map!) the CRS dialog pops u …

Can a memory layer be used as an input and/or output with runalg? With runandload I get this to work: processing.runandload("qgis:mergevectorlayers","memory:bufferOne", "memory:bufferTwo", r"memory …

I am unclear on why one should use QgsFeatureRequest() when iterating over a file’s features. Let’s say I would like to print out all IDs in my currently active dataset. Now, most examples will provi …

I will write a quick explanation of the pyuic4 and pyrcc4 commands for future reference. Most tutorials simply tell you to copy some code, but no one explains exactly what you are about to do. It is q …

A simple way would be using The polygon-line intersection tool from the SAGA toolbox. This would work: import processing polys = QgsVectorLayer(r"C:\PyQGIS_Test\polys.shp", 'poly', 'ogr') lines = Qg …

You could access the specific feature, without a loop, using the setFilterFid() method. In your case, if you wanted to call the feature in row 222, you would do: aLayer = iface.activeLayer() reques …

The following snippet works for me: uri = "file:///C:/testdata/somecsv.csv?delimiter=%s" % (";") lyr = QgsVectorLayer(uri, 'New CSV','delimitedtext') QgsMapLayerRegistry.instance().addMapLayer(lyr) F …

I am not performing the join via PyQGIS. The join is done manually and I would just like to use PyQGIS to detect which fields have been joined. …

In order to get the information in a table you would first have to access the layer's features. In my case, I put the features in a variable. Then you loop through the features, and for each feature y …