client.py

import google.auth
from google.auth import default
from google.auth.credentials import AnonymousCredentials
from google.auth.exceptions import DefaultCredentialsError
from google.auth.transport import requests
from google.oauth2 import service_account
from google.cloud import some_google_api_client

# Use default credentials if available, otherwise, use anonymous credentials
try:
    credentials, project_id = google.auth.default()
except DefaultCredentialsError:
    credentials = AnonymousCredentials()

# Initialize the client with the obtained credentials
client = some_google_api_client.Client(credentials=credentials)

# Now you can use the client to interact with the Google API
response = client.some_api_method()

# Handle the response accordingly