This is a simple NBA lineup optimizer for daily fantasy sports (DFS) on FanDuel. It accomplishes this by using a variation of the knapsack problem. The purpose of this project is to demonstrate one possible use of Google's free or-tools library, and the code is designed to be easy to read and understand.

An optimizer takes a set of projections (that is, a csv file containing a list of NBA players, their salaries, and the number of fantasy points that each player is expected to score), and calculates an optimized lineup that maximizes the number of expected points without exceeding the salary cap. The goal is to assemble the best possible fantasy team for a given day.

All you need is python (which you probably already have) and Google's or-tools library.

You can get free projections from various DFS websites, such as:

• NumberFire
• RotoGrinders
• RotoWire

However, you will probably have better results (and more fun) by learning to develop your own projection strategies.

$ python nba-optimizer.py example_2016-01-04.csv

Solved in 149 milliseconds!

Karl-Anthony Towns (C): $7,800 (37.9)
Russell Westbrook (PG): $10,700 (54.3)
Isaiah Thomas (PG): $8,100 (37.6)
Serge Ibaka (PF): $6,200 (31.9)
Frank Kaminsky (PF): $4,000 (29.1)
Jeremy Lamb (SG): $4,300 (23.7)
Gerald Green (SG): $3,800 (20.1)
LeBron James (SF): $9,800 (44.7)
Marcus Morris (SF): $5,300 (26.8)

Total: $60,000 (306.1)