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Results tagged with pyqgis
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user 150295
Python bindings for QGIS.
6
votes
How to change a project variable using Python?
In QGIS3, the API needs to pass QgsProject as the first argument.
It is: setProjectVariable(project: QgsProject, name: str, value: Any)
QgsExpressionContextUtils.setProjectVariable(QgsProject.instance …
- 527
3
votes
Set layer visibility using QgsMapCanvasLayer in QGIS 3?
The accepted answer is right and I simply want to mention that we can toggle on and off all the layers by:
bool = True # or False
root = QgsProject.instance().layerTreeRoot()
allLayers = root.layerOr …
- 527
2
votes
1
answer
246
views
QgsExpression cannot get expected result when there is "\" in the string
I hope to use QgsFeatureRequest(QgsExpression) to get desired features.
The statement in QgsExpression is:
expr = QgsFeatureRequest(QgsExpression("\"planid\" in (48757) AND spi like '0\\%'")
The feat …
- 527
3
votes
QGIS3 Python Plugin External Module
I use Mac and QGIS 3.4 and got the same error.
After checking the PyQt5 folder in QGIS, I found there is no QtChart file in the folder, which is the reason why we cannot import it.
And the version of …
- 527
5
votes
1
answer
304
views
Emitting signal when project property is changed using PyQGIS
QGIS API provides QgsExpressionContextUtils to set project properties.
But in the class, there isn't any signal.
I hope to connect to a signal whenever some of the properties were changed.
So is there …
- 527
1
vote
How to enable a keyboard shortcut for a plugin
Having a look at the pyqgis cookbook , it said to add a shortcut in the initGui() method.
self.key_action = QAction("Test Plugin", self.iface.mainWindow())
self.iface.registerMainWindowAction(self.key_action …
- 527
6
votes
0
answers
151
views
Is it safe to access layer object(e.g. QgsVectorLayer) in background task(QgsTask) in QGIS3
Because descriptions in PyQGIS cookbook are different with different versions. …
- 527
4
votes
Accepted
Hiding a layer in Layers panel, but showing in Map Canvas
I‘ve had the same question for a while and didn't find a proper solution.
Thanks to @Germán Carrillo's post and plugin, I found a way. Thank you so much.
Sorry I cannot install an extra plugin at work …
- 527
1
vote
Developing QGIS Python plugins using Jupyter?
There is an Ipython console(A kernel for Jupyter) for QGIS as a plugin, which you can add from QGIS official plugin repository or download from Github and copy to the plugin folder in QGIS.
https: …
- 527
2
votes
Accepted
Using "Crtl + C" to copy an item from QTableWidget in QGIS, but get all attributes from a fe...
After looking into the issue for some time, I finally found out why this happend.
Explain:
The weird behaviour was caused by QGIS. Actually, there is a global shortcut for "Control+C" to copy the sele …
- 527
1
vote
1
answer
358
views
Using "Crtl + C" to copy an item from QTableWidget in QGIS, but get all attributes from a fe...
I am using PyQGIS to develop a table as a QGIS 3.4 plugin.
The table is created by QTableWidget and looks good. …
- 527