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Question 11

Library Inventory System

Figure 1 shows a grid representing a 3x3 shelf indexing system in a library archives section.

Figure 1

	X	Y	Z
4
5
6			Book

Figure 2 shows an incomplete Python program designed to validate the user's shelf code input.

Figure 2

isValid = False
while isValid == False:
    code = ""
    while len(code) != 2:
        code = input("Enter shelf code (e.g. Y5): ")
        code = code.upper()

Extend the program from Figure 2 so it completes the other checks needed to make sure a valid shelf code is entered.

The shelf code is valid if:

there are exactly two characters
the first character entered is X, Y, or Z
the second character entered is 4, 5, or 6

Your extended program must:

use the variable isValid
repeat the steps until a valid shelf sequence is entered
output an appropriate error message if the shelf code entered is not valid

You should use indentation as appropriate, meaningful variable names, and correct Python syntax in your answer.

[6]

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