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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.

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  • 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. Jun 1, 2017 at 11:48

1 Answer 1

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

QgsMapLayerRegistry.instance().removeAllMapLayers()
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  • Is there any way to do it through the QgsProject Class? 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
    Jun 1, 2017 at 11:55
  • use QgsProject.instance().clear() ,qgis.org/api/2.18/… in QGIS3 you have QgsProject.instance().removeAllMapLayers () ,qgis.org/api/…
    – Fran Raga
    Jun 1, 2017 at 12:02

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