googlemaps package you are using is not an official one and does not use google maps API v3 which is the latest one from google.
You can use google’s geocode REST api to fetch coordinates from address. Here’s an example.
import requests
response = requests.get('https://maps.googleapis.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA')
resp_json_payload = response.json()
print(resp_json_payload['results'][0]['geometry']['location'])