How to rename several layers at the same time?

Question

I have got some GPS tracks (MultiLineString). As I import them to QGIS, they look like this:

I would like to merge them and to do so, I have to rename all of them like this (picture 2) otherwise an error occurs (all tracks become one single track at the same position).

I usually give numbers as names (e.g. 01-200). Sometimes I have only a few tracks but sometimes a lot.

Is it possible to rename all the tracks (layers) without renaming them one-by-one by hand?

Answer 1

You could try using the following in the Python Console:

x = 0

for layer in QgsMapLayerRegistry.instance().mapLayers().values():
    x = x + 1
    layer.setLayerName(str(x).zfill(2))

---

The zfill() command adds zeroes to the left of each layer name to fill the width. You can specify this with the total number of layers you want to add. This helps with sorting the layers in order.

E.g. with zfill(2):

1 = 01
9 = 09

With zfill(3):

1 = 001
90 = 090

Answer 2

try this:

canvas = qgis.utils.iface.mapCanvas() 
allLayers = canvas.layers() 
i = 1

for bla in allLayers: 
    name = "layer_"+str(i)
    bla.setLayerName(name) 
    i = i + 1