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

The easiest way is to use dateutil.parser.parse() to parse the date string into a timezone aware datetime object, then use strftime() to get the format you want.

import dateutil.parser

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