UTC time to EST conversion python

I have generated a UTC time in the following format

"2017-11-11T20:56:00.000Z"

using the following code snippet

datetime.datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%SZ")

Now I want to convert this to EST, is there any pythonic way of doing this. I looked at various solutions on the site but nothing is straightforward.