Remove layers in memory QGIS python

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I have a plugin with my own map canvas and I create a button in order to remove all the layers visible or opened in map canvas.I use this lines:

QgsMapLayerRegistry.instance().removeAllMapLayers()self.canvas.refresh() And it works but I noted that the layers are not in canvas but exist even that, I think they are in memory. How can I remove permanently the layers?

Thanks.Lia Duarte



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