bulk_import.py

from firebase_admin import auth

users = [
    auth.ImportUserRecord(
        uid='some-uid',
        display_name='John Doe',
        email='[email protected]',
        photo_url='http://www.example.com/photo.png',
        email_verified=True,
        provider_data=[
            auth.UserProvider(
                uid='google-uid',
                email='[email protected]',
                display_name='John Doe',
                photo_url='http://www.example.com/photo.png',
                provider_id='google.com'
            )
        ],
    ),
    # users list can contain up to 1000 records
]

result = auth.import_users(users)