Meet the tuples

Data Types in Python

Jason Myers

Instructor

Tuple, tuple

Hold data in order
Index
Immutable
Pairing
Unpackable

Zipping tuples

Tuples are commonly created by zipping lists together with zip()
Two lists: us_cookies, in_cookies

top_pairs = list(zip(us_cookies, in_cookies))

print(top_pairs)

[('Chocolate Chip', 'Punjabi'), ('Brownies', 'Fruit Cake Rusk'), 
('Peanut Butter', 'Marble Cookies'), ('Oreos', 'Kaju Pista Cookies'),
('Oatmeal Raisin', 'Almond Cookies')]

Unpacking tuples

Unpacking tuples is a very expressive way for working with data

us_num_1, in_num_1 = top_pairs[0]

print(us_num_1)

Chocolate Chip

print(in_num_1)

Punjabi

More unpacking in Loops

Unpacking is especially powerful in loops

for us_cookie, in_cookie in top_pairs:
    print(in_cookie)
    print(us_cookie)

Punjabi
Chocolate Chip
Fruit Cake Rusk
Brownies
# ..etc..

Enumerating positions

Another useful tuple creation method is the enumerate() function
Enumeration is used in loops to return the position and the data in that position while looping

for idx, item in enumerate(top_pairs):
    us_cookie, in_cookie = item
    print(idx, us_cookie, in_cookie)

(0, 'Chocolate Chip', 'Punjabi')
(1, 'Brownies', 'Fruit Cake Rusk')
# ..etc..

Be careful when making tuples

Use zip(), enumerate(), or () to make tuples

item = ('vanilla', 'chocolate')

print(item)

('vanilla', 'chocolate')

Beware of tailing commas!

item2 = 'butter',

print(item2)

('butter',)

Let's practice!

Data Types in Python