Question

On a roulette wheel, the pockets are numbered from 0 to 36. The colours of the pockets are as

follows:

• Pocket 0 is green.

• For pockets 1 through 10, the odd-numbered pocketsare red and the even-numberedpockets are black.

• For pockets 11 through 18, the odd-numberedpocketsare black and the even-numbered pockets are red.

• For pockets 19 through 28, the odd-numberedpocketsare red and the even-numberedpockets are black.

• For pockets 29 through 36, the odd-numberedpocketsare black and the even-numbered pockets are red.

Write a function, pocket_colour that takes an integer as parameter and returns the colour

corresponds to the pocket number. "The function should return the string "Error" if the user

enters a number that is outside the range of 0 through 36. Save the function in a PyDev library

module named functions.py

Write a testing program named t04.py that tests your function by asking the user to enter a pocket

number and displays whether the pocket is green, red, or black.

A sample run:

Enter a pocket number: 0

The selected pocket is green.

• Test your program with 10 different data, you may assume that the user will only enter

numbers.

• Copy the results to test

Answer 1

functions.py

def pocket_colour(n):
    if n<0 or n>36:
        print("Error")
    else:
        if n==0:
            return 'green'
        if n>0 and n<=10:
            if n%2==0:
                return 'black'
            else:
                return 'red'
        elif n>10 and n<=18:
            if n%2==0:
                return 'red'
            else:
                return 'black'
        elif n>18 and n<=28:
            if n%2==0:
                return 'black'
            else:
                return 'red'
        elif n>28 and n<=36:
            if n%2==0:
                return 'red'
            else:
                return 'black'

t04.py

import functions as f
num=int(input("Enter a pocket number:"))
colour=f.pocket_colour(num)
print("The selected pocket is "+colour+".")

test:

=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:0
The selected pocket is green.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:-5
The selected pocket is Error.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:39
The selected pocket is Error.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:3
The selected pocket is red.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:8
The selected pocket is black.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:23
The selected pocket is red.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:28
The selected pocket is black.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:34
The selected pocket is red.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:35
The selected pocket is black.
>>> 
=========================== RESTART: D:/python/t04.py ==========================
Enter a pocket number:17
The selected pocket is black.