Kelechi Kizito Ugwu
How to code a roulette payout simulation using Python

How to code a roulette payout simulation using Python

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Kelechi Kizito Ugwu
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6 min read

Table of contents

Introduction

A roulette payout simulation is a computer-generated or mathematical model that simulates the outcomes of roulette bets over a large number of spins.

This article is a tutorial on how to code a program that displays the following bets that payout in a roulette simulation using Python:

  • the color red or black

  • Odd or even numbers

  • High or low numbers

This article is aimed at Python developers and requires you have Python installed on your computer.

What is Roulette?

Roulette is a casino game of choice. Roulette involves a spinning wheel with numbered pockets (0–36) and a small ball that is dropped onto the wheel.

The numbered pockets are divided into three main colors:

  • red

  • black

  • green (0 or 00)

Players place bets on where they think the ball will land when the wheel stops spinning.

A player may choose to place a bet on:

  • a single number

  • various groupings of numbers

  • the color red

  • the color black

  • whether the number is odd or even

  • if the numbers are high (19–36)

  • if the numbers are low (1–18).

The payouts for each type of bet depend on the odds of winning, with riskier bets offering higher payouts.

Overview of a roulette payout simulation

A computer-generated model that mimics the outcomes of roulette bets over a large number of spins is a simulation.

This simulation is usually made possible using some sort of random character generator.

Using the random module, the steps provided in the following sections enumerate the steps to code the following:

  • the replica of the spinning of the roulette wheel.

  • the payout.

Placing a bet on colors

In numbers ranging from 1 to 10 and 19 to 28, odd numbers are red, and even numbers are black.

In numbers ranging from 11 to 18 and 29 to 36, odd numbers are black and even numbers are red.

  1. Import random module

import random

The random module above works with random data generation.

  1. Assign the randrange() function from the random module to a variable name value

value = random.randrange(0,38)

The code above sets a random number generator from 0 to 37 to a variable value.

  1. Use conditional statements to set the values for the green pockets

if (value == 0 ):

    print('The spin resulted in 0...\\nPay green')

elif (value == 37):  #USE 37 TO REP 00

    print('The spin resulted in 00...\\nPay green')
  1. Use conditional statements to set the values for the red pockets.

# RED POCKETS

elif ((value == 1) or (value == 3) or (value == 5) or (value == 7) or (value == 9) or (value == 12)

or (value == 14) or (value == 16) or (value == 18) or (value == 19) or (value == 21) or

(value == 23) or (value == 25) or (value == 27) or (value == 30) or (value == 32) or (value == 34)

or (value == 36)):

    print('Pay Red')
  1. Use conditional statements to set the values for the black pockets.

# BLACK POCKETS

elif not((value == 1) or (value == 3) or (value == 5) or (value == 7) or (value == 9) or (value == 12)

or (value == 14) or (value == 16) or (value == 18) or (value == 19) or (value == 21) or

(value == 23) or (value == 25) or (value == 27) or (value == 30) or (value == 32) or (value == 34)

or (value == 36) or (value == 37) or (value == 0)):

    print('Pay Black')
  1. End

import random

value = random.randrange(0,38)

if (value == 0 ):

    print('The spin resulted in 0...\\nPay green')

elif (value == 37):  #USE 37 TO REP 00

    print('The spin resulted in 00...\\nPay green')

# RED POCKETS

elif ((value == 1) or (value == 3) or (value == 5) or (value == 7) or (value == 9) or (value == 12)

or (value == 14) or (value == 16) or (value == 18) or (value == 19) or (value == 21) or

(value == 23) or (value == 25) or (value == 27) or (value == 30) or (value == 32) or (value == 34)

or (value == 36)):

    print('Pay Red')

# BLACK POCKETS

elif not((value == 1) or (value == 3) or (value == 5) or (value == 7) or (value == 9) or (value == 12)

or (value == 14) or (value == 16) or (value == 18) or (value == 19) or (value == 21) or

(value == 23) or (value == 25) or (value == 27) or (value == 30) or (value == 32) or (value == 34)

or (value == 36) or (value == 37) or (value == 0)):

    print('Pay Black')

Placing a bet on odd and even numbers

  1. Import random module

import random

The random module above works with random data generation.

  1. Assign the randrange() function from the random module to a variable name value

value = random.randrange(0,38)

The code above sets a random number generator from 0 to 37 to a variable value.

  1. Use conditional statements to set the values for the green pockets

if (value == 0 ):

    print('The spin resulted in 0...\\nPay green')

elif (value == 37):  #USE 37 TO REP 00

    print('The spin resulted in 00...\\nPay green')
  1. Use conditional statements to set the values for odd and even numbers

if (value % 2 == 1) and not(value == 37):

    print('Pay Odd')

elif (value % 2 == 0) and not(value == 0):

    print('Pay Even')
  1. End

import random

value = random.randrange(0,38)

if (value == 0 ):

    print('The spin resulted in 0...\\nPay green')

elif (value == 37):  #USE 37 TO REP 00

    print('The spin resulted in 00...\\nPay green')

if (value % 2 == 1) and not(value == 37):

    print('Pay Odd')

elif (value % 2 == 0) and not(value == 0):

    print('Pay Even')

Placing a bet on high and low numbers

The low bet is in the range of 1 – 18, while the high bet is in the range of 19 – 36.

  1. Import random module

import random

The random module above works with random data generation.

  1. Assign the randrange() function from the random module to a variable name value

value = random.randrange(0,38)

The code above sets a random number generator from 0 to 37 to a variable value.

  1. Use conditional statements to set the values for the green pockets

if (value == 0 ):

    print('The spin resulted in 0...\\nPay green')

elif (value == 37):  #USE 37 TO REP 00

    print('The spin resulted in 00...\\nPay green')
  1. Use conditional statements to set the values for high and low numbers

if (value >= 1) and (value <= 18):

    print('Pay low')

elif (value > 18) and (value <= 36):

    print('Pay high')
  1. End

import random

value = random.randrange(0,38)

if (value == 0 ):

    print('The spin resulted in 0...\\nPay green')

elif (value == 37):  #USE 37 TO REP 00

    print('The spin resulted in 00...\\nPay green')

if (value >= 1) and (value <= 18):

    print('Pay low')

elif (value > 18) and (value <= 36):

    print('Pay high')

Demo

The screenshots below illustrate how each code works.

  1. Placing a bet on colors

  2. Placing a bet on odd and even numbers

  3. Placing a bet on high and low numbers

Conclusion

To recap, you use the following to code the simulation:

  • random module

  • randrange() function

  • Conditional statements

  • Logical operators

  • Comparison operators

To use other methods, check out the following:

Additionally, feel free to ask any questions you may have in the comment section below.

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