oops = """\
oops I did it again
I played with your heart
got lost in the game
oh baby baby

oops you think I'm in love
that I'm sent from above
I'm not that innocent

oh baby baby
oh baby baby
oh
"""

fout = open('oops.txt', 'w')
print(oops, file=fout)
fout.close()

f = open('oops.txt')
fout = open('oops.double.txt', 'w')
for line in f:
    nextline = f.readline()
    print(line.strip(), '/', nextline.strip(), file=fout)

fout.close()