How do you convert YYYY-MM-DDTHH:mm:ss.000Z time format to MM/DD/YYYY time format in Python?

import datetime, dateutil.parser

d = dateutil.parser.parse('2008-09-26T01:51:42.000Z')
print d.strftime('%m/%d/%Y') #==> '09/26/2008'

>>> import time
>>> timestamp = "2008-09-26T01:51:42.000Z"
>>> ts = time.strptime(timestamp[:19], "%Y-%m-%dT%H:%M:%S")
>>> time.strftime("%m/%d/%Y", ts)
'09/26/2008'

def datechange(datestr):
dateobj=datestr.split('-')
y=dateobj[0]
m=dateobj[1]
d=dateobj[2]
datestr=d +'-'+ m +'-'+y
return datestr