Creating a new layer using Python script

Scripting
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3

And if you are running just Python scripts directly in Rhino and not via Grasshopper then it looks like this:

Simple, starting at 1 and going to n layers (user input):

import rhinoscriptsyntax as rs

def AddNumberedLayers():
    count=rs.GetInteger("Number of layers to add",minimum=1)
    if count is None: return
    
    for i in range(1,count+1):
        layername="{}".format(i).zfill(3)
        if not rs.IsLayer(layername): rs.AddLayer(layername)
AddNumberedLayers()

Allowing choice of start number and end number:

import rhinoscriptsyntax as rs

def AddNumberedLayersStartFin():
    start_n=rs.GetInteger("Number to start with",minimum=0)
    if start_n is None: return
    end_n=rs.GetInteger("Number to end with",minimum=start_n+1)
    if end_n is None: return
    
    for i in range(start_n,end_n):
        layername="{}".format(i).zfill(3)
        if not rs.IsLayer(layername): rs.AddLayer(layername)
AddNumberedLayersStartFin()

These will not attempt to add an already existing same-numbered layer.

Note the layer color is determined by the default layer color set in Rhino. One can also give them all a specific color, or a random color or…

For a specific color one can simply replace the line

if not rs.IsLayer(layername): rs.AddLayer(layername)

with

if not rs.IsLayer(layername): rs.AddLayer(layername,rs.coercecolor([255,0,0]))

where the number in the square brackets represents the RGB color.

The number of leading zeroes can be controlled by changing the number in the parentheses .zfill(3)

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