A list is a variable which can hold multiple values.
list_of_alpahbet = ['a','b','c','d'];
list_of_numbers= [1,2,3,4,5]
list_of_fruits = ['🍎','🍊','🍐','🥑','🥝','🍓','🍋','🍍']
mixed_list = ['a','b', 1,2, '🍓','🍋']
print(list_of_alpahbet)
print(list_of_numbers)
print(list_of_fruits)
print(mixed_list)
Generally, you want to keep your list homogeneous. That is, you want to keep elements of similar type within a list.
In the example, the first 3 lists (list_of_alpahbet, list_of_numbers, list_of_fruits) are recommended. The 4th list (mixed_list) isn't as it is not homogeneous.
Accessing elements in a list
Elements stored within a list can be accessed via their index.
The first element always has an index value of 0.
list_of_alpahbet = ['a','b','c','d'];
list_of_numbers= [1,2,3,4,5]
list_of_fruits = ['🍎','🍊','🍐','🥑','🥝','🍓','🍋','🍍']
mixed_list = ['a','b', 1,2, '🍓','🍋']
print(list_of_alpahbet[0])
print(list_of_numbers[1])
print(list_of_fruits[2])
print(mixed_list[3])
Nested lists
A list can be nested within another list.
# Nested lists
fruits_names = [
['Strawberry', '🍓'],
['Lemon', '🍋'],
['Pineapple', '🍍']
]
### Accessing the first list within a list.
print(fruits_names[0])
### Accessing the first value of the first nested list.
print(fruits_names[0][0])
Number of elements in a list.
To evaluate the number of elements in a list, we use the len() function.
list_of_fruits = ['🍎','🍊','🍐','🥑','🥝','🍓','🍋','🍍']
print(len(list_of_fruits));
Adding new elements to a list
Use .append() to add new elements to a list.
fruits_names = [
['Strawberry', '🍓'],
['Lemon', '🍋'],
['Pineapple', '🍍']
]
## Adding a new element to the list
fruits_names.append(['Avocado', '🥑'])
print(fruits_names)
Removing from list
Use .remove() to remove an element from a list.
fruits_names = [
['Strawberry', '🍓'],
['Lemon', '🍋'],
['Pineapple', '🍍']
]
## Removing an element from the list
fruits_names.remove(['Lemon', '🍋'])
print(fruits_names)
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