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FreeWheel Linear Programming Interface for Python

Project description



Flipy is a Python linear programming interface library, originall developed by FreeWheel. It currently supports Gurobi and CBC as the backend solver.

To use Gurobi, make sure you have a Gurobi license file, and gurobipy is installed in your Python environment. You can find details from Gurobi’s documentation.

Flipy requires Python 3.6 or newer.


Flipy can be installed with setuptools.

$ git clone
$ cd flipy
$ python install


Here is a simple example for Flipy:

import flipy

# 1 <= x <= 3.5
x = flipy.LpVariable('x', low_bound=1, up_bound=3.5)
# 2 <= y <= 4
y = flipy.LpVariable('y', low_bound=2, up_bound=4)

# 5x + y <= 12
lhs = flipy.LpExpression('lhs', {x: 2.5, y: 1})
rhs = flipy.LpExpression('rhs', constant=12) 
constraint = flipy.LpConstraint(lhs, 'leq', rhs)

# maximize: 3x + 2y
objective = flipy.LpObjective('test_obj', {x: 3, y: 2}, sense=flipy.Maximize)
problem = flipy.LpProblem('test', objective, [constraint])

solver = flipy.CBCSolver()
status = solver.solve(problem)

Get the solution

After solving, a status is returned to indicate whether the solver has found a optimal solution for the problem:

# <SolutionStatus.Optimal: 1>

The objective value can be retrieved with objective.evaluate():

# 17.6

The value of variables can be retrieved with .evaluate() as well:

# 3.2
# 4.0

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