Using removeall map layers for QgsProject in PyQGIS?

Question

I want to rewrite a projekt with new layers while owerwriting all old layers. I found the function removeAllMapLayers in the qgis.core api

But when i try:

project = QgsProject.instance()
project.removeAllMapLayers()

Where I am in a project with some layers. After trying the code I get this error:

Traceback (most recent call last):
File "<input>", line 1, in <module>
AttributeError: 'QgsProject' object has no attribute 'removeAllMapLayers'

Is there any other way to empty all layer in a project? I want to write to the same project when it's empty.

It works and clears all. Unfortunatley i also want to be able to clear projects I am not in but that isn't how my question is frased. — VilyaSeeFour, Commented Jun 1, 2017 at 11:48

Joseph · Accepted Answer · 2017-06-01 11:46:01Z

7

You could use the QgsMapLayerRegistry::removeAllMapLayers() method to remove all layers in your project:

QgsMapLayerRegistry.instance().removeAllMapLayers()

answered Jun 1, 2017 at 11:46

Joseph

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Is there any way to do it through the QgsProject Class?
– VilyaSeeFour
Commented Jun 1, 2017 at 11:49
2

@VilyaSeeFour - Atleast in QGIS 2.18, removeAllMapLayers() no longer seems to be available in the QgsProject Class. You could use QgsProject.instance().clear() which resets your project to a completely blank state. Or iterate all layers in your project using a for loop and then remove them using QgsProject.instance().removeMapLayers() :)
– Joseph
Commented Jun 1, 2017 at 11:55
1

use QgsProject.instance().clear() ,qgis.org/api/2.18/… in QGIS3 you have QgsProject.instance().removeAllMapLayers () ,qgis.org/api/…
– Fran Raga
Commented Jun 1, 2017 at 12:02

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