How get layer by name in PyQGIS 3.0?

If you are sure there is one layer named LAYER_NAME, the shortest way:

layer = QgsProject.instance().mapLayersByName('LAYER_NAME')[0]

In that way, you can get a layer in a group layer.

print(layer)
# OUT: <qgis._core.QgsVectorLayer object at ...>

listLayers=QgsProject.instance().mapLayersByName('layername')

Retrieve a list of matching registered layers by layer name.

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