One picture is more than 1000 words:
pip install eyeD3
pyid3py.py [OPTION] TARGET
Convert Chinese characters in mp3 ID3 to PinYin.
-r, --recursive act on directory recursively.
-p, --preferred don't prompt. prefer default pronunciation
for Hanzi with multi-pronunciation.
-f, --force add fileds no matter whether the info exist.
-n, --dry-run don't actually add fileds, just show how it works.
-h, --help show this messge.
Use it on your own risk.