For API key go here:
https://console.developers.google.com/apis/library?project=mimetic-setup-137723
and create a new project of Google Maps JavaScript API

Then open the credentials tab and find your key http://i.imgur.com/CHymySp.png (embed)

Then open example.py and change the KEY line to look like mine http://i.imgur.com/g1S57ha.png (embed)

save and rerun script