A list is the most versatile data type in Python. A list can hold different types of data and is written using brackets []. Lists are perfect for when you need an ordered list of items and can be changed (mutable) after they are created.
list = []
list = ["words", "are", "strings"]
list = [1, 2, 3]
list = ["string", 2]
lovely_list = list()
To read the items in a list, you can either specify the index or iterate over the entire list.
list = ["all", "is", "well", "that", "ends", "well"]
>>list[2]
"well"
for item in list: print(item)
all is well that ends well
A dictionary holds key and value pairs and is written using braces {}. The value of a key can also be a string, number, or list []. Dictionaries are perfect for when you just need to remember keys and can be changed (mutable) after they are created.
dictionary = {}
dictionary = {'key': 'value'}
dictionary = {'key': 1}
dictionary = {'name': 'abby', 'school': 'NSS', 'languages': ['javascript', 'angular', 'python', 'django']}
lovely_dictionary = dict()
To read the items in a list, you just need to remember the key.
>>> print(dictionary['school'])
NSS
A set is similar to a list, but each item must be unique and cannot repeat. Sets are unordered and can be changed (mutable) after they are created.
lovely_set = [1, 1, 2, 2, 2, 2, 2, 3, 3]
>> set(lovely_set)
{1, 2, 3}
A tuple is also similar to a list in that it can hold different types of data. However, a tuple is immutable (cannot change) after it is created and uses parenthesis instead. A tuple containing a single item requires a trailing comma.
lovely_tuple = tuple()
lovely_tuple = ('Abby', 'NSS', 'Nashville')
another_tuple = ('Abby',)
>>> print(lovely_tuple)
('Abby', 'NSS', 'Nashville')