Fix mp3 id3 tags

id3_fix.py

import os
import mutagen.id3

tryencodings = ['cp1251']
path = './'

def findMP3s(path):
    for child in os.listdir(path):
        child = os.path.join(path, child)
        if child.lower().endswith(".mp3"):
            yield child

for path in findMP3s(path):
    id3 = mutagen.id3.ID3(path)
    for key, value in id3.items():
        if value.encoding != 3 and hasattr(value, 'text') and isinstance(getattr(value, 'text', [None])[0], str):
            if value.encoding==0:
                bytes= '\n'.join(value.text).encode('iso-8859-1')
                for encoding in tryencodings:
                    try:
                        bytes.decode(encoding)
                    except UnicodeError:
                        pass
                    else:
                        break
                else:
                    raise ValueError('None of the tryencodings work for %r key %r' % (path, key))
                for i in range(len(value.text)):
                    value.text[i]= value.text[i].encode('iso-8859-1').decode(encoding)
            value.encoding = 3
    id3.save()