ok i have a question: why do i have to put apostrophes when i list letters: ['a','b','c'] but when i list numbers not: [1,2,3] ?

Answer 1

Letters are characters. If you didn't, they would be like variables. (ie x or y, with a value pertaining to them.)

Answer 2

This indicates to the python engine that the item is either a character or a number. You can use the characters '1' '2' '3' to create words and phrases, and numbers 1 2 3 to do maths.

Answer 3

https://code.sololearn.com/cvGAcZO5Sx8X/?ref=app

Answer 4

im just doing this for the achievement