toggle matcap library through python?

Coding Python Support
1

is it possible to toggle the matcap library?

I know the toolshelf can be toggled. There must be a way, if not, please correct me.

2 

import bpy


for window in bpy.context.window_manager.windows:
    screen = window.screen


    for area in screen.areas:
        if area.type == 'VIEW_3D':
            area.spaces[0].use_matcap = True
            area.spaces[0].matcap_icon = '19'
3

Thanks for this useful script, but i would like to actually open the library rather than choosing a matcap.