12: Iteration in Python

Extend it:

For this challenge you will need to use iteration to write a python program to display the following children’s song:

10 green bottles sitting on the wall
10 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 9 green bottles sitting on the wall

9 green bottles sitting on the wall
9 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 8 green bottles sitting on the wall

8 green bottles sitting on the wall
8 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 7 green bottles sitting on the wall

7 green bottles sitting on the wall
7 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 6 green bottles sitting on the wall

6 green bottles sitting on the wall
6 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 5 green bottles sitting on the wall

5 green bottles sitting on the wall
5 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 4 green bottles sitting on the wall

4 green bottles sitting on the wall
4 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 3 green bottles sitting on the wall

3 green bottles sitting on the wall
3 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 2 green bottles sitting on the wall

2 green bottles sitting on the wall
2 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 1 green bottles sitting on the wall

1 green bottles sitting on the wall
1 green bottles sitting on the wall
And if one green bottle should accidentally fall
There'll be 0 green bottles sitting on the wall

The starting point for your code just displays the first verse:

Challenges:

1. Add the other 9 verses
   

   Whilst it’d be easy to just print out each line of the song, think about which bits repeat and what changes in each verse so that you can adapt it using for and while loops later

2. Use a for loop
   

   The first line of each verse repeats twice. You could use a for loop to repeat it instead of printing the lyrics both times.

3. Use a while loop
   

   You could make a variable called bottles and set it to 10. Your while loop could then keep decreasing bottles by 1 each time it repeats a verse until bottles gets to 0

Page 1: Intro

Page 2: The theory: learn what you need to know as fast as possible.

Page 3: Try it: try out and adapt some working python code snippets.

Page 4: Debug it: Learn how to find and fix common mistakes.

Page 5: Extend it: Choose a project idea to use your newfound python skills.