# Lab 2-2: Pluralizer¶

## Lab Requirements and Specifications¶

Two horses. Five monkeys. Twenty flies. One cat. Nine lives. Despite the English language being one of the most commonly used languages around the world, it is also quite complicated to learn if you are not a native speaker. Taking a noun and converting it to its plural form has a dozen rules and even more special cases.

In this lab, you will be creating a program that will take in two inputs: a non-negative number, and a singular noun. If the number entered is 1, then you would just print out “1 horse”. However, if the number is 0 or greater than 1, you would print out the number and the pluralized version of the word - like “0 horses” or “4 horses”.

Your program will be handling the following rules to pluralize nouns:

If it ends in... Rule Example
-fe Replace “fe” with “ves” knife, knives
-y Replace “y” with “ies” family, families
-sh, -ch Add “es” to the end bush, bushes
-us Replace “us” with “i” cactus, cacti
-ay, -oy, -ey, -uy Add “s” to the end
guy, guys
boy, boys
key, keys
day, days
(The above rule is included because it is a special case that conflicts with the first “y” rule.)
All other cases Add “s” to the end cat, cats

Note that in order to handle cases where the word ends in “y” correctly, you will need to take some care. It is important that you order your conditions so that your code will check for the special case endings of “ay”, “oy”, “ey”, and “uy” before simply checking whether a word ends in “y”.

You should name your file FILN_pluralizer.py, where FILN is your first initial and last name, all lowercase, no space.

Although it is a good idea to come up with some of your own test cases to realize the limitations your own code for this lab (and other labs) the following are some inputs you can use to verify that your program works as intended. I would also recommend using the examples in the table above.

 Input (#) Input (word) Result 0 dog 0 dogs 1 city 1 city 5 fish 5 fishes 33 fly 33 flies 8 life 8 lives 20 cactus 20 cacti

Note that some words covered by special cases will look incorrect if used in this program. Examples: bus should be buses, not bi / foot should be feet, not foots, etc. It’s important to realize that for now, you want to make sure that the words follow your rules, regardless of whether it is actually an English word or not.

The following space is provided in case you want to test code out or write it in the browser:

## Taking it Further¶

You can extend the functionality of your program by including all possible rules and special cases. Performing a google search on “plural nouns rules” will provide numerous resources on the various rules and exceptions in making a noun plural. See how many you can incorporate, then challenge your peers or teachers to stump your program!

Next Section - Lesson 03-01: Categories of Errors