python - PulpSolverError : PuLP: Error while trying to execute glpsol in Python 2. 7

Question

我通过 iPython 笔记本和 Python 2.7 在 OS X 上运行 PuLP。 glpk 使用 brew install homebrew/science/glpk 安装，PuLP 通过 pip install pulp 安装。

但是我在 Python 中遇到错误:

---------------------------------------------------------------------------
PulpSolverError                           Traceback (most recent call last)
<ipython-input-15-689fef0dd94f> in <module>()
      1 # Solve the problem
----> 2 status = prob.solve(GLPK(msg=0))
      3 

/Users/x/anaconda/envs/data/lib/python2.7/site-packages/pulp/pulp.pyc in solve(self, solver, **kwargs)
   1641         #time it
   1642         self.solutionTime = -clock()
-> 1643         status = solver.actualSolve(self, **kwargs)
   1644         self.solutionTime += clock()
   1645         self.restoreObjective(wasNone, dummyVar)

/Users/x/anaconda/envs/data/lib/python2.7/site-packages/pulp/solvers.pyc in actualSolve(self, lp)
    364                              stderr = pipe)
    365             if rc:
--> 366                 raise PulpSolverError("PuLP: Error while trying to execute "+self.path)
    367         else:
    368             if os.name != 'nt':

PulpSolverError: PuLP: Error while trying to execute glpsol

这是触发此错误的代码:

from pulp import *

#Variables
x = LpVariable('x')
y = LpVariable('y')

# Problem
prob = LpProblem('problem', LpMinimize)

# Constraints
prob += x + y <= 1
prob += x <= 1
prob += -2 + y <= 4

# Objective function to minimize
prob += 

# Solve the problem
status = prob.solve(GLPK(msg=0))

导致错误的原因是什么，如何修复？

Answer 1

如果你跑

pulp.pulpTestAll()

你可能会看到这样一行:

Solver pulp.solvers.GLPK_CMD unavailable

如果是这样，你所要做的就是在你的 linux 上安装 glpk-utils 包。如果你成功了，你应该可以调用

glpsol

同样来自命令行。