import codecs
import io

# create a file with two lines
with open('test.txt', 'w') as fp:
    print('first line\x0b\x0bblah blah\nsecond line\n', file=fp, end='')

# codecs parses lines incorrectly
print(list(codecs.getreader('utf-8')(open('test.txt', 'rb'))))
#['first line\x0b', '\x0b', 'blah blah\n', 'second line\n', '\n']

# TextIOWrapper does it correctly
with open('test.txt', 'rb') as bytes_fp:
    fp = io.TextIOWrapper(bytes_fp, encoding='utf-8')
    print(list(fp))