How to add MP3 background music to the slideshow

[nickhu168]

source：
prs = Presentation('d:/a2.pptx')
shape = prs.slides[0].shapes.add_movie('d:/a2.mp3', 10,10,50,50);

catch exception：
Traceback (most recent call last):
File "D:\Python3\Python36\lib\site-packages\pptx\util.py", line 134, in get_prop_value
return getattr(obj, cache_attr_name)
AttributeError: '_MoviePicElementCreator' object has no attribute '__pic'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\Python3\Python36\lib\site-packages\pptx\util.py", line 134, in get_prop_value
return getattr(obj, cache_attr_name)
AttributeError: '_MoviePicElementCreator' object has no attribute '__video_part_rIds'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File ".\convert.py", line 27, in
shape = prs.slides[0].shapes.add_movie('d:/media.mp3', 10,10,50,50);
File "D:\Python3\Python36\lib\site-packages\pptx\shapes\shapetree.py", line 487, in add_movie
poster_frame_image, mime_type
File "D:\Python3\Python36\lib\site-packages\pptx\shapes\shapetree.py", line 852, in new_movie_pic
mime_type
File "D:\Python3\Python36\lib\site-packages\pptx\util.py", line 136, in get_prop_value
value = f(obj)
File "D:\Python3\Python36\lib\site-packages\pptx\shapes\shapetree.py", line 869, in _pic
self._shape_id, self._shape_name, self._video_rId,
File "D:\Python3\Python36\lib\site-packages\pptx\shapes\shapetree.py", line 937, in _video_rId
return self._video_part_rIds[1]
File "D:\Python3\Python36\lib\site-packages\pptx\util.py", line 136, in get_prop_value
value = f(obj)
File "D:\Python3\Python36\lib\site-packages\pptx\shapes\shapetree.py", line 926, in _video_part_rIds
self._video
File "D:\Python3\Python36\lib\site-packages\pptx\parts\slide.py", line 188, in get_or_add_video_media_part
media_part = self._package.get_or_add_media_part(video)
File "D:\Python3\Python36\lib\site-packages\pptx\package.py", line 58, in get_or_add_media_part
return self._media_parts.get_or_add_media_part(media)
File "D:\Python3\Python36\lib\site-packages\pptx\package.py", line 214, in get_or_add_media_part
media_part = self._find_by_sha1(media.sha1)
File "D:\Python3\Python36\lib\site-packages\pptx\package.py", line 227, in _find_by_sha1
if media_part.sha1 == sha1:
AttributeError: 'Part' object has no attribute 'sha1'