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By Steven F. Lott

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Feel free to research additional betting systems or invent your own. Martingale. The Martingale system starts with a base wagering amount, w, and a count of the number of losses, c, initially 0. Each loss doubles the bet. Any given spin will place an amount of w × 2c on a 1:1 proposition (for example, red). When a bet wins, the loss count is reset to zero; resetting the bet to the base amount, w. This assures that a single win will recoup all losses. Note that the casinos effectively prevent successful use of this system by imposing a table limit.

If we do decompose this object, we will have to ask which class would own these two arrays? If Wheel keeps these, then Table becomes very tightly coupled to these two arrays that should be Wheel ‘s responsibility. If Table keeps these, then Wheel is priviledged to know details of how Table is 38 Chapter 4. 1-Python implemented. If we need to change these arrays to another storage structure, two classes would change instead of one. Having the name and odds in a single Outcome object allows us to change the representation of an Outcome.

Examples include "1", "Red". odds Holds the payout odds for this Outcome. Most odds are stated as 1:1 or 17:1, we only keep the numerator (17) and assume the denominator is 1. We can use name to provide hash codes and do equality tests. 2 Constructors __init__(self, name, odds) Parameters • name (str) – The name of this outcome • odds (int) – The payout odds of this outcome. Sets the instance name and odds from the parameter name and odds. 3 Methods For now, we’ll assume that we’re going to have global instances of each Outcome.

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