我的操作系统是window 7，Pulp版本是1.6.1，gurobi版本是7.0.1。可以成功导入gurobipy。 Pull.solvers.GUROBI确实通过了测试，所以我可以使用gurobi。然而，pulp.solvers.CPLEX_CMD 失败了。这是错误消息：
pulp.pulpTestAll()
Testing zero subtraction
Testing inconsistant lp solution
Testing continuous LP solution
Testing maximize continuous LP solution
Testing unbounded continuous LP solution
Testing Long Names
Testing repeated Names
Testing zero constraint
Testing zero objective
Testing LpVariable (not LpAffineExpression) objective
Testing Long lines in LP
Testing LpAffineExpression divide
Testing MIP solution
Testing MIP solution with floats in objective
Testing MIP relaxation
Testing feasibility problem (no objective)
Testing an infeasible problem
Testing an integer infeasible problem
Testing column based modelling
Testing dual variables and slacks reporting
Testing fractional constraints
Testing elastic constraints (no change)
Testing elastic constraints (freebound)
Testing elastic constraints (penalty unchanged)
Testing elastic constraints (penalty unbounded)
* Solver pulp.solvers.PULP_CBC_CMD passed.
Solver pulp.solvers.CPLEX_DLL unavailable
Testing zero subtraction
Testing inconsistant lp solution
Testing continuous LP solution
Testing maximize continuous LP solution
Testing unbounded continuous LP solution
Testing Long Names
Testing repeated Names
Testing zero constraint
'_dummy'
('* Solver', <class pulp.solvers.CPLEX_CMD at 0x000000000B224CA8>, 'failed.')
Solver pulp.solvers.CPLEX_PY unavailable
Solver pulp.solvers.COIN_CMD unavailable
Solver pulp.solvers.COINMP_DLL unavailable
Solver pulp.solvers.GLPK_CMD unavailable
Solver pulp.solvers.XPRESS unavailable
Testing zero subtraction
Testing inconsistant lp solution
Testing continuous LP solution
Testing maximize continuous LP solution
Testing unbounded continuous LP solution
Testing Long Names
Testing repeated Names
Testing zero constraint
Testing zero objective
Testing LpVariable (not LpAffineExpression) objective
Testing LpAffineExpression divide
Testing MIP solution
Testing MIP solution with floats in objective
Testing MIP relaxation
Testing feasibility problem (no objective)
Testing an infeasible problem
Testing an integer infeasible problem
Testing column based modelling
Testing Sequential Solves
Testing fractional constraints
Testing elastic constraints (no change)
Testing elastic constraints (freebound)
Testing elastic constraints (penalty unchanged)
Testing elastic constraints (penalty unbounded)
* Solver pulp.solvers.GUROBI passed.
Testing zero subtraction
Testing inconsistant lp solution
Testing continuous LP solution
too many values to unpack
('* Solver', <class pulp.solvers.GUROBI_CMD at 0x000000000B224FA8>, 'failed.')
Solver pulp.solvers.PYGLPK unavailable
Solver pulp.solvers.YAPOSIB unavailable
Traceback (most recent call last):
File "<ipython-input-21-94f8f423594d>", line 1, in <module>
pulp.pulpTestAll()
File "C:\Users\Guodong\Software\Anaconda2\lib\site-packages\pulp\pulp.py", line 2283, in pulpTestAll
raise PulpError("Tests Failed")
PulpError: Tests Failed
我遇到了同样的错误。这是 Gurobi_CMD 的问题。 Gurobi 通过了所有测试，但在 Gurobi_CMD 上失败了。
我通过卸载并重新安装 Gurobi，并更改 PuLP 的 .cfg 文件以正确指向 Gurobi 安装来解决此问题。
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