Coding Dojo

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Participants: DaniloSato , DeiseAoki , EduardoKatayama , FabricioSousa , HugoCorbucci , JacquelineMarchetti , JulianMonteiro , MarianaBravo , PauloCheque , RafaelBarroso , RicardoAbe and ThiagoColucci

Scribe: DaniloSato

Kata: Poker Hands in Python (an slightly easier version of KataTexasHoldEm )


20:00 ~ 20:15 Dojo Introduction

Since we had four new members, we decided to go quickly through our Dojo Introduction slides.

20:15 ~ 20:20 Discussion of the Kata

The problem was already attacked in the last meeting, so we discussed a little some different implementation approaches to rank different hands. We decided to calculate the rank by sorting the cards, multiplying each card value by a power of 15 (based on the sorting order) and, for each type of hand, give greater powers of 15. This way we would be able to compare two hand’s by their ranks. An example (already sorted): 2H 4D 7S 8C 8H => 2*15**0 + 4*15**1 + 7*15**2 + 8*15**3 + 8*15**4 + 8*15**5 (the 5th power stands for the pair). If the hand had two pairs, the lower pair would have the 5th power and the higher pair would have the 6th power of 15 and so on…

20:20 ~ 22:00 Coding Session

We decided to try a Randori style again, in Python. The first two pairs were able to quickly code the Card and Hand objects (and parsing). From then on, we implemented tests and code to calculate the rank of different kinds of hands. We had some trouble to get the Two Pairs test passing. After that, we were able to continue smoothly. Although we were not able to finish the Kata, we went much farther then the last meeting. The code is available at

22:00 ~ 22:15 Retrospective

The new environment (Linux, Eclipse, Pydev) worked better; we found that this was one of the most organized meetings following a Randori style. We enjoyed following the strategy chosen in the beginning of the meeting, as well as the new members of the Dojo. The people felt that it wouldn’t be interesting to try this Kata again in the next meeting, althought some said they would try it at home.