I've wrote a plugin and when I was tested it I found a plugin's case of use that it has to handle with null values. I've had some research and doesnt found much about it in PyQGIS3 documentation, but I read about NULL
from qgis.core
and write the code below:
from qgis.core import QgsProject, NULL
layer = QgsProject.instance().mapLayersByName('My_Layer_Name')[0]
selection = layer.selectedFeatures()
n_sel = layer.selectedFeatureCount()
if n_sel > 0:
layer.startEditing()
for feature in selection:
pos = feature['offset_quad']
if pos == NULL:
pos = 0
else:
pos = int(feature['offset_quad'])
# do some stuf here
I'd like to know if there is a better "pythonic" way to do this test for null values.
Best Answer
I guess a somewhat more pythonic method could be to use:
So something like: