これHTMLのひな形にデータを入れている

gistfile1.txt

buf = []
for num, item in enumerate (start_session_logs):
    st = item
    tm = item["terminate log"]
    text = "[ '{0}', '{1}'".format (1+num, st["User"])
    text = text + ", new Date({0})".format (st["DateTime"].strftime ('%Y, %m, %d, %H, %M, %S'))
    if tm:
        text = text + ", new Date({0})".format (tm["DateTime"].strftime ('%Y, %m, %d, %H, %M, %S'))
        text = text + "],"
        buf.append (text)

buf[-1] = buf[-1].rstrip(',')

#print start_and_term_relationship

datarows = "\n            ".join (buf)
print html.format(datarows)