======= Linear Program, 선형계획법 =======

  * PuLP
    * https://github.com/coin-or/pulp
    * https://benalexkeen.com/linear-programming-with-python-and-pulp/
  * Scipy.optimize
    * https://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.linprog.html
    * https://datascienceschool.net/view-notebook/0fca28c71c13460fb7168ee2adb9a8be/
  * CVXOPT
    * https://cvxopt.org/index.html
    * https://cvxopt.org/examples/tutorial/lp.html