time.struct_time(tm_year=2013, tm_mon=10, tm_mday=11, tm_hour=11, tm_min=57, tm_sec=12, tm_wday=4, tm_yday=284, tm_isdst=0)

'2013-10-11T11:57:12Z'

iso = time.strftime('%Y-%m-%dT%H:%M:%SZ', timetup)

>>> import time
>>> timetup = time.gmtime()
>>> time.strftime('%Y-%m-%dT%H:%M:%SZ', timetup)
'2013-10-11T13:31:03Z'

>>> from datetime import datetime
>>> datetime(*timetup[:6]).isoformat()
'2013-10-11T13:31:03'

iso = time.strftime('%Y-%m-%dT%H:%M:%SZ', timetup)

iso = time.strftime('%Y-%m-%dT%H:%M:%S', timetup)