sets# Production Model: lemonade stand example# Notebooks > Production Model: lemonade stand example Description: Basic introduction to AMPL’s indexed entities and the Pygwalker Python package via a lemonade stand example Tags: ampl-lecture, amplpy, ampl, introduction, linear-programming, sets, indexing, lemonade-stand Author: Gyorgy Matyasfalvi (15 notebooks) <gyorgy@ampl.com>