import bpy
bpy.context.object.data.sky.atmosphere_turbidity = 6.0
bpy.context.object.data.sky.sky_blend_type = 'ADD'
bpy.context.object.data.sky.sky_blend = 1.0
bpy.context.object.data.sky.horizon_brightness = 4.99999761581
bpy.context.object.data.sky.spread = 1.49011614159e-09
bpy.context.object.data.sky.sky_color_space = 'SMPTE'
bpy.context.object.data.sky.sky_exposure = 1.0
bpy.context.object.data.sky.sun_brightness = 1.00000011921
bpy.context.object.data.sky.sun_size = 4.0
bpy.context.object.data.sky.backscattered_light = 1.0
bpy.context.object.data.sky.sun_intensity = 1.0
bpy.context.object.data.sky.atmosphere_inscattering = 1.0
bpy.context.object.data.sky.atmosphere_extinction = 1.0