use on Mac,split My Clippings.txt by booktitle ( 4 year old script

kindnotes.py

#filename: kindlesplit.py
f=open('My Clippings.txt').read()
notes = f.split('==========\r\n')
lines = []
booktitle = []
lines = notes[:]

for i in range(len(lines)):
    lines[i]=lines[i].split('\r\n')
    booktitle.append(lines[i][0])

booktitle = list(set(booktitle))

for i in range(1,len(booktitle)):
    filename = booktitle[i].decode('utf-8') + '.txt'
    thefile = open(filename,'w')
    for j in range(len(notes)):
        if booktitle[i]==lines[j][0]:
            thefile.write(notes[j])
            thefile.write('\r\n')