date - How to get on python current time?

I need to have the date.
The format of the time
should be 2017-01-18T07:34:35Z
I have tried this but
it does not work:

import
            datetime
i = datetime.datetime.now()

date = %i.year "-"
            %i.month "-" %i.day "T" %i.hour ":" %i.minute ":" %i.second
            "Z"