@property<EOL><INDENT>def success(self):<DEDENT>
self._check_valid()<EOL>return self._problem._cp.solution.get_status() in (<EOL>self._problem._cp.solution.status.optimal,<EOL>self._problem._cp.solution.status.optimal_tolerance,<EOL>self._problem._cp.solution.status.MIP_optimal)<EOL>
Return boolean indicating whether a solution was found