Question

This assignment focuses on writing functions. These functions will be used to make the structure of the program cleaner and clearer. They will use parameters. There is no need to use return values in the core of this assignment. (The challenge option might be easier if you use return values. For more information, see section 5.7 in the text.)

Overview

The children's song that we'll work on is "Old McDonald". In case you aren't familiar with it, here are a couple example verses:

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a chicken, E-I-E-I-O.
With a cluck-cluck here, and a cluck-cluck there.
Here a cluck, there a cluck, everywhere a cluck-cluck.
Old McDonald had a farm, E-I-E-I-O.

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a cow, E-I-E-I-O.
With a moo-moo here, and a moo-moo there.
Here a moo, there a moo, everywhere a moo-moo.
Old McDonald had a farm, E-I-E-I-O.

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a duck, E-I-E-I-O.
With a quack-quack here, and a quack-quack there.
Here a quack, there a quack, everywhere a quack-quack.
Old McDonald had a farm, E-I-E-I-O.

The very observant among you may notice that this version of the song has been simplified slightly.
[Participation fodder: what's the simplification? ]

Standard Version

For the standard version:

• Complete all the work for the minimal version.
• Additionally, write a fourth function function that shall ask the user for an animal and its sound.
• Name this function newVerse. The newVerse function is parameterless, that is, it has empty parens.
• After collecting this information from the user, the newVerse function shall print out another verse with the user-provided animal and sound values.
• There is no input validation needed for the user's input for animal or sound.
• The new function shall not call the print function to print out the verse. Instead, the newVerse function shall call the verse function to generate its output.
• In main, following the other function calls, call the newVerse function. Note, this prints out a fourth verse to the song.
• In main, following the call to the new verse function, the script shall ask the user if they want a fifth verse. Depending on the user's answer, the new verse function shall be called a second time.
• This question about the fifth verse shall expect the answers: yes / no.
• It is reasonable to tell the users what the expected values are.
• The code should be robust enough to take some default action if the user doesn't give one of the "expected" answers.
• The default action shall be to prompt for the animal and sound for the fifth verse.

The last two three bullet points can be translated as:

There are only two possible answers for the "Do you want a fifth verse?" question. Tell the user what the choices are. If the user picks one of them, do that. If the user's input doesn't match either of your two choices, assume that the user wants to do a fifth verse.

Sample Run

Here is an example of what the Standard assignment will look like, when run. The user input is shown in bold blue characters.

Old McDonald

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a chicken, E-I-E-I-O.
With a cluck-cluck here, and a cluck-cluck there.
Here a cluck, there a cluck, everywhere a cluck-cluck.
Old McDonald had a farm, E-I-E-I-O.

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a cow, E-I-E-I-O.
With a moo-moo here, and a moo-moo there.
Here a moo, there a moo, everywhere a moo-moo.
Old McDonald had a farm, E-I-E-I-O.

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a duck, E-I-E-I-O.
With a quack-quack here, and a quack-quack there.
Here a quack, there a quack, everywhere a quack-quack.
Old McDonald had a farm, E-I-E-I-O.

Enter an animal: horse
Enter the sound the horse makes: neigh

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a horse, E-I-E-I-O.
With a neigh-neigh here, and a neigh-neigh there.
Here a neigh, there a neigh, everywhere a neigh-neigh.
Old McDonald had a farm, E-I-E-I-O.

Do you want to have a fifth verse (yes/no)? nah

Enter an animal: pig
Enter the sound the pig makes: oink

Old McDonald had a farm, E-I-E-I-O.
And on that farm he had a pig, E-I-E-I-O.
With a oink-oink here, and a oink-oink there.
Here a oink, there a oink, everywhere a oink-oink.
Old McDonald had a farm, E-I-E-I-O.

In this example, for the obligatory fourth verse, the user entered horse and neigh. Then the user was asked about the fifth verse. The "acceptable answers" are "yes" and "no", as indicated in the question. The user's response was "nah". Since it doesn't match either of the expected answers ("yes" or "no"), the default action (the assumption) is to call the newVerse function and get the animal and sound for a fifth verse. The user entered pig and oink for the fifth verse.

Challenge Version

For the extra-credit version:

• Complete all the work for the standard version.
• Update the verse function to handle animal names or sounds that begin with a vowel. For the purposes of this assignment, there are exactly five vowels: A E I O U. Case does not matter. Also, we will not worry about the pronunciation, just the spelling. So, it would be "an unicorn" or "a honor" (Yes, I know "honor" is not an animal, but I can think of an animal whose name begins with a silent "h".)
  Examples:

  Old McDonald had a farm, E-I-E-I-O.
  And on that farm he had a pig, E-I-E-I-O.
  With an oink-oink here, and an oink-oink there.
  Here an oink, there an oink, everywhere an oink-oink.
  Old McDonald had a farm, E-I-E-I-O.

  Old McDonald had a farm, E-I-E-I-O.
  And on that farm he had an owl, E-I-E-I-O.
  With a who-who here, and a who-who there.
  Here a who, there a who, everywhere a who-who.
  Old McDonald had a farm, E-I-E-I-O.

• Update the verse function by creating "helper" function that will remove code repetition. For example, the first line and the last line of the verse could be printed by the same "helper" function. A significant place to reduce code duplication is in the a/an logic since that must appear 6 times in the verse function otherwise.

Notes about the challenge version:

• There shall be only one verse function. Notice that the write-up states that the verse function is updated. Submissions with multiple verse functions shall not get credit for the challenge options.

Answer 1

def title():
print("The name of the song: "Old McDonald"")
print(" ")
  
def verse(animal, sound):
print("Old McDonald had a farm, E-I-E-I-O. And on that farm he had a "+ animal+" , E-I-E-I-O. With a "+ sound+" - "+sound+" here, and a "+ sound+" - "+sound+" there. Here a "+ sound+" , there a "+ sound+", everywhere a "+ sound+" - "+
sound+" . Old McDonald had a farm, E-I-E-I-O.")
print(" ")

def main():
title()
verse('chicken', 'cluck')
verse('cow', 'moo')
verse('duck', 'quack')

main()

showing indentation:

output: