14.614, 14.624, 14.512, 14.615, etc.

ff = open('AvailableTickets.txt', 'r').read()
ff2 = ff
ff = ff.replace(',', '')
ff = ff.split()
ff = map(float, ff)
if len(ff) < 10:
    ff3 = open('TestTickets.txt', 'r+')
    ff3.write(str(ff2))
else:
        ff3 = open('TestTickets.txt', 'r+')
        for x in range(0, 10):
            ff3.write(str(ff[len(ff)-x])+', ')

with open('AvailableTickets.txt', 'r') as fin:
    tickets_raw = fin.read()
    tickets_list = tickets_raw.split(', ')
    with open('TestTickets.txt', 'a') as f:
        if len(tickets_list) < 10:
            f.write(tickets_raw)
        else:
            f.write(', '.join(tickets_list[-10:]))