Google API OAuth 2.0 Authorization Sample in Python 3 (with requests-oauthlib)

google_oauth2_python3.py

from requests_oauthlib import OAuth2Session

# Credentials you get from registering a new application
client_id = "<the id you get from google>"
client_secret = "<the secret you get from google>"

# OAuth endpoints given in the Google API documentation
authorization_base_url = "https://accounts.google.com/o/oauth2/v2/auth"
token_url = "https://www.googleapis.com/oauth2/v4/token"
scope = [
         "openid",
         "https://www.googleapis.com/auth/userinfo.email",
         "https://www.googleapis.com/auth/userinfo.profile"
         ]

google = OAuth2Session(client_id, scope=scope, redirect_uri="oob")

# Redirect user to Google for authorization
authorization_url, state = google.authorization_url(authorization_base_url,
                                                    # offline for refresh token
                                                    # force to always make user click authorize
                                                    access_type="offline", prompt="select_account")
print("Please go here and authorize:", authorization_url)

# Get the authorization verifier code from the callback url
code = input("Paste the authorization code: ")
print()  # New line after the input line for the next print

# Fetch the access token
google.fetch_token(token_url, client_secret=client_secret,
                   code=code)

# Print the token
print(google.access_token)

# Fetch a protected resource, i.e. user profile
r = google.get("https://www.googleapis.com/oauth2/v1/userinfo")
print(r.content)