GhPython script for getting the names of a children of a Layer

LayerChildren.py

"""
Returns all child layers of a specified layer.
    Inputs:
        Layer: The layer to check for children.
               {item, str}
    Output:
        Children: The child layers of the specified layer.
                  {item/list/tree, str}
    Remarks:
        Author: Max Eschenbach
        License: MIT License
        Version: 210119
"""

# import rhino and gh stuff
import rhinoscriptsyntax as rs
import scriptcontext
import Rhino
import Grasshopper

# get documents
ghd = ghenv.Component.OnPingDocument()
rhd = Rhino.RhinoDoc.ActiveDoc

# set rhinodoc as active document
scriptcontext.doc = rhd

# check for layer children
if rs.IsLayer(Layer) and rs.LayerChildCount(Layer):
    full_names = rs.LayerChildren(Layer)
    Children = []
    for fn in full_names:
        Children.append(fn.split("::")[-1])
else:
    Children = Grasshopper.DataTree[object]()

# set rhinodoc as active document
scriptcontext.doc = ghd