conv.py

actual = [['0:00.762', '0:01.435'], ['2:01.374', '2:07.423'], ['3:01.412', '3:07.314']]
expected = [['0.762', '1.435'], ['121.374', '127.423'], ['181.412', '187.314']]


def convert(s):
    mins, secs = s.split(':')
    mins = int(mins)
    secs = float(secs)
    secs = 60 * mins + secs
    return secs


def convert_pair(p):
    p0, p1 = convert(p[0]), convert(p[1])
    return [str(p0), str(p1)]


times = map(convert_pair, actual)
print times
print times == expected