QGIS Python (PyQGIS) - Calculate Field Values (Field Calculator)

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Learn to add fields to a vector layer and populate attribute fields with the QGIS Python (PyQGIS) API. This tutorial will take you through an example of adding fields to a vector layer and calculating a field value from existing fields. Additionally, you will learn how to troubleshoot common problem you may experience.

  1. Geospatial School
  2. open source
  3. open source options
  4. qgis
  5. python
  6. pyqgis
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Комментарии
Автор

Hi, Is there a group by and summarize possibility on vector attribute table using pyqgis?

sriramab
Автор

Hi. Thank you for the videos. I really appreciate it that they are focused on geospatial analysis. I also like the way you 'make mistakes'. It teaches me even more. Keep the good work going. Thank you!

PLRaeva
Автор

Hi Mr. Konrad,
Please help me,
How can i concatenate two field by field calculator

trunghieubui
Автор

Thanks a lot Konrad!
Can you please make a video on conditional statements (if, elif, else) in the pyQGIS console?

driesdams
Автор

Hi Mr. Konrad,

How if we want to calculate using the existed field/column of the layer?

iqbaltriputra
Автор

Thank you for this video. I used the method to create a map for which i needed to include a set of almost 200 expression. I'm still quite new to PyQGIS. Is there a way to create a list of all the defined expressions and afterwards loop over them? I don't want to copy-paste this code 200 times:

with edit(layer):
for f in layer.getFeatures():
context.setFeature(f)
f['NewVariable'] = expression1.evaluate(context)
layer.updateFeature(f)

I appreciate any hint or answer!
Thank you in advance!

MerlinMalin
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How to kml convert shapefile. Kml have table tag.

GIS-Engineer
Автор

Hi how do i run this in qgis3 processing script??

allanmazimwe