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A poker hand evaluation and equity calculation library

Project Description

Python Texas Hold’em hand evaluation library based on Anonymous7’s codebase which is in turn based on Keith Rule’s hand evaluator (which you can see here). The library also provides a parser for an extended set of PokerStove style range strings, and a more or less working equity calculator, though that still needs a little cleaning up.

The library is fairly basic at the moment; only the functionality needed by Flop Ferret has been fully implemented. Time permitting, the goal is to provide a fully featured poker hand evaluator and range equity calculator with a clean native python interface and all performance critical parts implemented in Cython.


eval7 requires python 2.6+. The build process requires cython (tested with 0.23). If you have a working copy of python:

pip install cython

should work on most platforms. Installing via your package manager or from source should also work.

Simple Installation:

pip install eval7


Basic usage:

>>> import eval7
>>> from pprint import pprint
>>> deck = eval7.Deck()
>>> deck.shuffle()
>>> hand =
>>> pprint.pprint(hand)
>>> eval7.evaluate(hand)

>>> hand = [eval7.Card(s) for s in ('As', '2c', '3d', '5s', '4c')]
>>> eval7.evaluate(hand)

Larger numbers represent better hands!

Card objects provide a convenient python interface to cards with rank and suit attributes.

Deck object provide some basic functionality that might be useful for simple simulations such as sample, shuffle, and deal. The deck code isn’t very well optimized at this point, so while it works well for quick lightweight simulations, you’re not going to get the performance out of it needed for precise range vs. range equity calculations.

Hand Ranges

eval7 also provides a parser for weighted PokerStove style hand ranges.


>>> from pprint import pprint
>>> hr = eval7.HandRange("AQs+, 0.4(AsKs)")
>>> pprint(hr.hands)
[((Card("Ac"), Card("Qc")), 1.0),
 ((Card("Ad"), Card("Qd")), 1.0),
 ((Card("Ah"), Card("Qh")), 1.0),
 ((Card("As"), Card("Qs")), 1.0),
 ((Card("Ac"), Card("Kc")), 1.0),
 ((Card("Ad"), Card("Kd")), 1.0),
 ((Card("Ah"), Card("Kh")), 1.0),
 ((Card("As"), Card("Ks")), 1.0),
 ((Card("As"), Card("Ks")), 0.4)]

>>> hr = eval7.HandRange("AJ+, ATs, KQ+, 33-JJ, 0.8(QQ+, KJs)")
>>> len(hr)

At present the HandRange objects are just a thin front-end for the range-string parser. Ultimately the hope is to add Cython backed sampling, enumeration, and HandRange vs. HandRange equity calculation.

Release History

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