Import cache in blender using python API

bpy.ops.cachefile.open(filepath=path)
cache_file = bpy.data.cache_files[-1]
cache_file.scale = 1.0 # default value is 0...

# WORKAROUND: force cache_files.object_paths attribut refresh by
# creating a modifier on a plane, and delete them.
bpy.ops.object.select_all(action='DESELECT')
bpy.ops.mesh.primitive_plane_add()
bpy.context.active_object.modifiers.new(name="cache_workaround", type='SOLIDIFY')
bpy.ops.object.delete(use_global=False, confirm=False)