blender textures render and node

key word: python access in blender, texture, render, bake, node

bpy.context.scene.render.engine = 'CYCLES'
bpy.context.scene.cycles.samples = 1
bpy.context.scene.cycles.bake_type = 'EMIT'
bake_image = bpy.data.images.new("BakeResult", width=512, height=512)
image_node = nodes.new('ShaderNodeTexImage') # here nodes should be created previously.
image_node.image = bake_image
image_node.select = True
material.node_tree.nodes.active = image_node bpy.ops.object.bake(type='EMIT')

refer to original file:
How to generate Textures without Rendering to File?