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Questions tagged [pyqgis]

Use for the python library that applies to the Qgis GIS program.

Python bindings for the Qgis GIS program. Example code and descriptions can be found at https://docs.qgis.org/3.10/en/docs/pyqgis_developer_cookbook/index.html

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How can we create a raster attribute table using QGIS Python

I have a couple of raster files and I need to create attribute tables for them in QGIS using PyQGIS. I have tried raster attribute table plugin but how can I do it from the Python console?
Sam A S
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Setting color of Qgs Symbol to an expression or variable

I'm working with QgsSymbolLayer and I want to set the stroke color to an expression (@symbol_color) but I can't seem to figure it out. And the documentation doesn't talk about using expressions for it. I basically want to do what is in the photo…
Nidal Barada
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Script for validating the entries made by the user in pyqgis

I am writing a script in pyqgis which should perform the following task: First it should read a csv file which we consider it as a input csv,csv file will be something like this: layer ,columnname ,condition ,values layer1…
Ayan
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Delete features with PyQGIS in a loop

I have been for months trying unsuccesfully to make a function which can compare a feature with the other ones in a shp layer and if some conditions fulfill, the feature in the loop is deleted. I need it for my final work. The conditions to delete a…
waldemar
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pyQGIS: Can I establish an event-listener on common qgis function like "Split Features"

I'm trying to react on a QGIS build-in function by attaching an event-listener of some sort. Unfortunalely, my reserch didn't give me any possible approach. So I have no code to show. So my question is pretty general. I know qgis has an event…
bowser
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AttributeError: 'dict' object has no attribute 'startEditing'

Good morning, I'm new to pyqgis. I'm trying to create a new field in my attribute table but it's not working if someone can help me I appreciate it follow the code: # Calculadora de campo alg_params = { 'FIELD_LENGTH': 0, …
hostilio maia
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Trigger Refresh from subClass to mainClass

I have a main dialog which displays information, and it also has a edit data button. When the edit data button is clicked a new dialog appears where you can edit and change and data and press OK to save it into the txt file that stores the data. I'm…
Nidal Barada
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How to fix PyQgis layout resizing problem when making window bigger?

I'm working on creating python plugin that implements image viewer and use layout to plased elements in correct plases. I want to resize all elements in dialog window of this plugin using resizeEvent of QDialog, but I have one strange problem: when…
Danylo
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PYQGIS: How to use QgsRasterFileWriter.writeRaster to create raster from numpy array

I am trying to use the method writeRaster from qgis.core.writeRaster to create a singleBand raster of float and Nans but according to the documentation, I need to provide theses inputs: writeRaster( self, # OK pipe: QgsRasterPipe, # Q1 …
Vincent Bénet
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PyQGIS - is it possible to promote my own class in Qt Designer?

While I developed QGIS plugin, I get some problem with promoting class in Qt Designer. I create plugin, using Plugin Builder and after that I reorganize the structure to this: Structure So now, when I promote a ComboBox in Qt Designer to my combobox…
Kaemer
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I failed to access HTTPS's WMS service using PyQGIS's QgsRasterLayer

uri = '''https://vmap0.tiles.osgeo.org/wms/vmap0?LAYERS=basic&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&FORMAT=image%2Fjpeg&SRS=EPSG%3A4326&BBOX=-90,45,-45,90&WIDTH=256&HEIGHT=256 ''' layer = QgsRasterLayer(uri, "RESA", "WMS") if…
elephant111
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QMessageBox black out

I have a pyqgis script done in QGIS 2.18 which basically open a QGIS3 project with around 9 layers. There is a lag until these layer are displayed on the canvas so I put a QMessageBox to display a waiting message for the user. This is the…
Marian Tudorache
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pyqgis standalone applicaton windows

Ive downloaded QGIS 3.22 according to documentation, I need to set PYTHONPANTH and PATH to make pyqgis visible from python for a stand alone application: set PYTHONPATH=c:\python such folder doesnt exist. Specificly c:\program files\qgis…
m3ntor
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Using a QGIS Custom Function in a python script

I want to take a custom function for QGIS made in python and use it in a python script. The function came from this answer https://gis.stackexchange.com/questions/245146/getting-quantity-of-intersecting-lines-of-polygons-in-qgis and I updated it to…
MrKingsley
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Error when reloading new Plugin code in QGIS

I am nooby to Plugin Development but I'm trying to create a plugin in QGIS, for a Uni-subject, with its own graphical interface, which will receive a zipcode from the user and return the name of the corresponding location. I already created the…
Zeca
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