snippet showing how to use the AWS Cognito client to sign_up to a user pool.

cognito_client_sign_up.py

resp = client.sign_up(
            ClientId = os.getenv('CLIENT_ID'),
            SecretHash=get_secret_hash(email, os.getenv('CLIENT_ID'), os.getenv('CLIENT_SECRET')),
            Username=email,
            Password=password,
            UserAttributes=[
                {
                    "Name": "custom:favorite_band",
                    "Value": favorite_band
                },
                {
                    "Name":"name",
                    "Value":name
                }
            ]
            
        )