blender script - export sound for each selected strip in VSE

VSE_export_audio_by_selected_strips.py

import bpy
import os

C = bpy.context
scn = C.scene
dest_folder = os.path.dirname(scn.render.filepath)
if not os.path.exists(dest_folder):
    print ("ERROR, destination folder must exist:\n", dest_folder, "not found")
else:
    count = 0
    for s in scn.sequence_editor.sequences:
        if s.select:
            count += 1
            scn.frame_start = s.frame_final_start
            scn.frame_end = s.frame_final_end
            fp = os.path.join(scn.render.filepath, s.name.split('.')[0] + '_part_' + str(count).zfill(2) + '.wav')
            print ('saving', fp)
            bpy.ops.sound.mixdown(filepath=fp, relative_path=False, container='WAV', codec='PCM', format='S16')