Getting QGIS 2.x python code to work in QGIS 3.x? object has no attribute 'legendInterface' problem

You could just replace:

layers = iface.legendInterface().layers()

with

layers = [layer for layer in QgsProject.instance().mapLayers().values()]

The equivalent of

layers = self.iface.legendInterface().layers()

in QGIS 3.0 is

layers = [tree_layer.layer() for tree_layer in QgsProject.instance().layerTreeRoot().findLayers()]

This recursively finds all layers and returns them in the same order as listed in Layers Panel.

I found this to list layers:

layers = qgis.core.QgsProject.instance().layerTreeRoot().layerOrder()

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