How to get the name and email address of the signed in user from Google?

Many thanks for sharing this tutorial, I'm trying to work out how to retrieve the user details from the callback. 

I was wondering if the following code is related to this:

`session["name"] = id_info.get("name")
  session["email"] = id_info.get("email")`

I tried saving these values into a variable and printing them but to no avail. 