How do I generate a python timestamp to a particular format?

You can use datetime with strftime. Exemple:

import datetime

date = datetime.datetime.now().strftime("%Y-%m-%dT%H:%M:%S.%f")

print(date)

Will print:

2017-09-20T12:59:43.888955

See the following example:

import datetime 
now = datetime.datetime.now()
now.strftime('%Y-%m-%dT%H:%M:%S') + ('-%02d' % (now.microsecond / 10000))

This could result in the following: '2017-09-20T11:52:32-98'