Python 2.7.10 (default, Oct 23 2015, 19:19:21)
[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
Academic license - for non-commercial use only

Gurobi Interactive Shell (mac64), Version 8.0.1
Copyright (c) 2018, Gurobi Optimization, LLC
Type "help()" for help

gurobi> m = read("hw2.1.lp")
Read LP format model from file hw2.1.lp
Reading time = 0.00 seconds
: 13 rows, 8 columns, 25 nonzeros
gurobi> m.optimize()
Optimize a model with 13 rows, 8 columns and 25 nonzeros
Variable types: 0 continuous, 8 integer (8 binary)
Coefficient statistics:
  Matrix range     [1e+00, 1e+00]
  Objective range  [1e+00, 1e+00]
  Bounds range     [1e+00, 1e+00]
  RHS range        [1e+00, 1e+00]
Presolve removed 13 rows and 8 columns
Presolve time: 0.01s
Presolve: All rows and columns removed

Explored 0 nodes (0 simplex iterations) in 0.01 seconds
Thread count was 1 (of 4 available processors)

Solution count 1: 1

Optimal solution found (tolerance 1.00e-04)
Best objective 1.000000000000e+00, best bound 1.000000000000e+00, gap 0.0000%
gurobi> m.printAttr("X")

    Variable            X
-------------------------
       x11c1            1
       x21c2            1
       x12c2            1
       x22c1            1
gurobi> quit()