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I can change the window type to "node editor" with

bpy.context.window_manager.windows[0].screen.areas[0].type = 'NODE_EDITOR'

but how to set it type to "compositing"?

enter image description here

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If you mouse over the property you will see it is the SpaceNodeEditor.tree_type property you want to set. The screen is split into areas, these areas have regions, toolbar header etc, and spaces. I've put a print statement in to show the spaces for the area. To get the space associated with an area use area.spaces.active or context.space_data (after changing the context.area.type)

import bpy
from bpy import context

area = context.area

area.type = 'NODE_EDITOR'
# the context area is now a node editor
# the space has the tree_type enum

for sp in area.spaces:
    print(sp, sp.type, "has tree_treetype", hasattr(sp, "tree_type"))

space = context.space_data
# or better still
space = area.spaces.active
# set to compositing    
space.tree_type = 'CompositorNodeTree'

To find space.tree_type = 'CompositorNodeTree' run code above with space.tree_type = 'Blah' which gives the options in the error message.

TypeError: bpy_struct: item.attr = val: 
enum "Blah" not found in 
('ShaderNodeTree', 'CompositorNodeTree', 'TextureNodeTree')
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  • $\begingroup$ Thanks, it works for me as: bpy.context.window_manager.windows[0].screen.areas[0].spaces.active.tree_type = 'CompositorNodeTree' $\endgroup$ – Korchiy Dec 10 '16 at 13:51

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