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List Basics

List overview:

List is one of the simplest and most important data structures in Python.

Lists are collections of ordered items called 'elements', they are enclosed in square brackets [ ] and separated by a comma ','

the items in a list are , they don't need to be the same data type, these items can even be a list itself!

Some examples of lists:

numbers = [1, 3, 5, 7]                     # list of numbers
eye_color = ['blue', 'brown', 'black']     # list of strings
empty_lst = []
lst = [[1,2], [3,4], [5,6]]                # list of lists

Some ways to generate lists

Number list: Other than just typing in a list, we can call list() function on range() function to generate a number list.

num_lst = list(range(5))
print(num_lst)

This way we get a number list showed in the console:

[0,1,2,3,4]

We can easily get a even number list this way:

even = list(range(2, 11, 2))
print(even)         # result: [2,4,6,8,10]

Save your fingers from over typing if you need a list with a thousand numbers.

List 'operations' create new lists

'add' two list together, make two number lists and the third list is the addition of the first two. Build columns in 3 different color representing the 3 lists and compare them.

lst1 = [1,2,3]
lst2 = [6,7,8,9]
lst3 = lst1 + lst2

print(lst3)    # [1,2,3,6,7,8,9]

'multiply' a list with a number

Make a number list, my_lst, assign value my_lst * 3 to a new list result.

my_lst = [1,8]
result = my_lst * 3
print( result )    # [1,8,1,8,1,8]