def getTimestamps(fileName):
    last_tid = ''
    D = []
    with open(fileName, 'r') as rf:
        reader = csv.reader(rf)
        for line in reader:
            tid = line[0]
            if ((last_tid != '') and (last_tid != tid)):
                break
            timestamp = line[1]
            D.append(timestamp)
            last_tid = tid
    return D
def getTimestamps(fileName):
    last_tid = 
    D = []
    with open(fileName, 'r') as rf:
        reader = csv.reader(rf)
        for line in reader:
            tid = line[0]
            if ((last_tid != ) and (last_tid != tid)):
                break
            timestamp = line[1]
            D.append(timestamp)
            last_tid = tid
    return D