<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_dict(self):
 """ Constructs an dictionary representation of the Identity Object to be used in serializing to JSON :return: dict representing the object """

        json_dict = {"apiKey": self.api_key,
                     "userArn": self.user_arn,
                     "cognitoAuthenticationType": self.cognito_authentication_type,
                     "caller": self.caller,
                     "userAgent": self.user_agent,
                     "user": self.user,
                     "cognitoIdentityPoolId": self.cognito_identity_pool_id,
                     "cognitoAuthenticationProvider": self.cognito_authentication_provider,
                     "sourceIp": self.source_ip,
                     "accountId": self.account_id
                     }

        return json_dict