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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def presigned_url(self, method, bucket_name, object_name, expires=timedelta(days=7), response_headers=None, request_date=None):
 """ Presigns a method on an object and provides a url Example: from datetime import timedelta presignedURL = presigned_url('GET', 'bucket_name', 'object_name', expires=timedelta(days=7)) print(presignedURL) :param bucket_name: Bucket for the presigned url. :param object_name: Object for which presigned url is generated. :param expires: Optional expires argument to specify timedelta. Defaults to 7days. :params response_headers: Optional response_headers argument to specify response fields like date, size, type of file, data about server, etc. :params request_date: Optional request_date argument to specify a different request date. Default is current date. :return: Presigned put object url. """

        is_valid_bucket_name(bucket_name)
        is_non_empty_string(object_name)

        if expires.total_seconds() < 1 or \
           expires.total_seconds() > _MAX_EXPIRY_TIME:
            raise InvalidArgumentError('Expires param valid values'
                                       ' are between 1 sec to'
                                       ' {0} secs'.format(_MAX_EXPIRY_TIME))

        region = self._get_bucket_region(bucket_name)
        url = get_target_url(self._endpoint_url,
                             bucket_name=bucket_name,
                             object_name=object_name,
                             bucket_region=region)

        return presign_v4(method, url,
                          self._access_key,
                          self._secret_key,
                          session_token=self._session_token,
                          region=region,
                          expires=int(expires.total_seconds()),
                          response_headers=response_headers,
                          request_date=request_date)