fantasyfb

Fantasy football league simulation and optimization toolkit. Pulls projections from nflverse data, syncs roster state from a Yahoo Fantasy league, and runs Monte Carlo season simulations to value pickups, trades, and draft picks.

Docs: https://tefirman.github.io/fantasyfb/

Install

pip install fantasyfb

For local development:

git clone https://github.com/tefirman/fantasyfb.git
cd fantasyfb
pip install -e ".[dev]"

Python 3.10+ is required.

Quickstart

import fantasyfb as fb

league = fb.League(name="My Team")
schedule_sim, standings_sim = league.season_sims(postseason=True)
print(standings_sim[["team", "wins_avg", "playoffs", "winner"]])

fb.League(name=...) reads from the Yahoo Fantasy API, so you'll need oauth2.json (and .env with CONSUMER_KEY / CONSUMER_SECRET) set up alongside the script. See the yahoo_oauth docs for a walkthrough.

Command-line tools

After install, four entry points are on your PATH:

Command	Source	Use
`fantasyfb`	`fantasyfb.league:main`	Weekly projections + lineup analysis
`snake-draft`	`fantasyfb.drafts.snake:main`	Live snake-draft cockpit
`salary-cap-draft`	`fantasyfb.drafts.salary_cap:main`	Live salary-cap (auction) draft tool
`draft-prep`	`fantasyfb.drafts.prep:main`	Pre-draft tiers / VORP / mocks

# Weekly run for a team
fantasyfb --team "My Team" --sims 1000 --adds --drops

# Pre-draft analytics
draft-prep tiers --team "My Team"
draft-prep mock --team "My Team" --adp ADP.csv --my-pick 7 --sims 50

# Draft-day cockpit
snake-draft --team "My Team" --adp ADP.csv
salary-cap-draft --team "My Team"

Run any command with --help for the full option list.

Public API

from fantasyfb import (
    League,                            # main entry point
    FantasyScorer,                     # scoring rules -> points
    MatchupModel, ProjectionEngineV2,  # projection internals
    LineupOptimizer,
    SeasonSimulator, ScheduleManager,
    NflreadpyProvider,                 # default data backend
)

Lower-level utilities live in submodules and can be imported directly:

from fantasyfb.drafts.tools import compute_vorp, assign_tiers, MockDraft
from fantasyfb.drafts.snake_cockpit import build_board, view_best
from fantasyfb.sim.backtest import run_backtest, evaluate
from fantasyfb.io.excel_exporter import FantasyExcelExporter

Subpackage	Purpose
`fantasyfb.league`	Top-level `League` class
`fantasyfb.configs`	League / scoring presets
`fantasyfb.drafts`	Snake, salary-cap, prep, shared draft math
`fantasyfb.data`	Yahoo client + nflverse providers
`fantasyfb.scoring`	Scoring, lineup optimization, matchups
`fantasyfb.projections`	V2 projection engine, walk-forward fitter
`fantasyfb.sim`	Season simulation, backtests, schedule
`fantasyfb.analysis`	WAR, move analysis
`fantasyfb.io`	Excel export

Development

pip install -e ".[dev]"
pytest                       # full test suite
python -m build              # produce sdist + wheel under dist/

The tests/ directory pulls a small slice of nflverse parquet data on first run; subsequent runs are cached locally.

License

MIT. See LICENSE.

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