How to use the quadprog.solvers.solvers.CPLEX function in quadprog

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=0)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=1)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

n = 10*k

# Set options of the OSQP solver
options = {'eps_abs':       1e-5,
           'eps_rel':       1e-5,
           'alpha':         1.6,
           'scale_problem': True,
           'scale_steps':   20,
           'polish':        False}

# Create a lasso object
portfolio_obj = portfolio(k, n, dens_lvl=0.3, version='sparse',
                          osqp_opts=options)

# Solve with different solvers
resultsCPLEX = portfolio_obj.solve(solver=CPLEX)
resultsGUROBI = portfolio_obj.solve(solver=GUROBI)
resultsOSQP = portfolio_obj.solve(solver=OSQP)

# Print objective values
print "CPLEX  Objective Value: %.3f" % resultsCPLEX.objval
print "GUROBI Objective Value: %.3f" % resultsGUROBI.objval
print "OSQP   Objective Value: %.3f" % resultsOSQP.objval
print "\n"

# Print timings
print "CPLEX  CPU time: %.3f" % resultsCPLEX.cputime
print "GUROBI CPU time: %.3f" % resultsGUROBI.cputime
print "OSQP   CPU time: %.3f" % resultsOSQP.cputime

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=0)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=0)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=1)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=0)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=0)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=0)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results

def solve(self, solver=OSQP):
        """
        Solve the problem with a specificed solver.
        """
        if solver == OSQP:
            results = self._osqp.solve()
        elif solver == CPLEX:
            results = self._prob.solve(solver=CPLEX, verbose=0)
        elif solver == GUROBI:
            results = self._prob.solve(solver=GUROBI, OutputFlag=0)
        else:
            assert False, "Unhandled solver"
        return results