def resolveExpression(self, retina_name, body, sparsity=1.0):
        """Resolve an expression
        Args:
            retina_name, str: The retina name (required)
            body, ExpressionOperation: The JSON formatted encoded to be evaluated (required)
            sparsity, float: Sparsify the resulting expression to this percentage (optional)
            Returns: Fingerprint
        """

        resourcePath = '/expressions'
        method = 'POST'

        queryParams = {}
        headerParams = {'Accept': 'Application/json', 'Content-Type': 'application/json'}
        postData = None

        queryParams['retina_name'] = retina_name
        queryParams['sparsity'] = sparsity
        postData = body
        response = self.apiClient._callAPI(resourcePath, method, queryParams, postData, headerParams)
        return fingerprint.Fingerprint(**response.json())