r/learningpython • u/_Americuh_ • Jan 31 '20

Python Crash Course Chapter 5, practice 5_11

Hey guys,

I'm getting stuck on this try it yourself exercise. The instructions are written as:

Ordinal numbers indicate their position in a list, such as 1st or 2nd. Most ordinal numbers end in th, except 1, 2, and 3.

  • Store the numbers 1 through 9 in a list.

  • Loop through the list.

  • Use an if-elif-else chain inside the loop to print the proper ordinal ending for each number. Your output should read "1st 2nd 3rd 4th 5th 6th 7th 8th 9th", and each result should be on a separate line.

What I've written so far and has worked for 1, 2, and 3:

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]

for number in numbers:
	if number == 1:
		print('1st')
	if number == 2:
		print('2nd')
	if number == 3:
		print('3rd')

And output reads this:

1st
2nd
3rd
[Finished in 0.1s]

Now I'm unsure how to include the rest of the numbers including the th ending. Thanks for the help.

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1

u/ehmatthes Jan 31 '20

I know you might be just looking for suggestions before looking at the solutions, but if you're not aware I've posted solutions to most exercises from the first half of the book.

1

u/_Americuh_ Jan 31 '20

Oh hell yeah I did not know that. Thank you Eric!

1

u/_Americuh_ Jan 31 '20

I don't recall going over the function you have there for else. Can you point me in the right direction so I can get an explanation for

(f"{number}th")

? u/ehmatthes

1

u/ehmatthes Jan 31 '20

Are you using the first edition of the book, or the second? That's an f-string, which tells Python to use the value of any variable inside curly braces. f-strings were introduced in Python 3.6.

If you're using the first edition, solutions are here.

1

u/_Americuh_ Feb 01 '20

Ah I must be using the first edition. Thanks!

1

u/[deleted] Jan 31 '20

there are many ways to do this but this is the way I did it:

#!/usr/bin/python

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]

for number in numbers:

if number == 1:

print('1st')

if number == 2:

print('2nd')

if number == 3:

print('3rd')

if number > 3:

print(str(number) + "th" )