Tuples

instance of tuple class. it is ordered sequence of elements. it is immutable. duplicate elements allowed.

create a tuple

use () or tuple() to create a tuple.

color = ('red', 'green', 'blue')
transport = tuple(('car', 'plane', 'train'))
# note the double parentheses
msg_pref = 'email', 'text', 'phone'
# without parentheses

access elements

use tuple[index] to access elements. negative index available.

print(color[1])
# green

print(transport[-1])
# train

change element

Not possible. TypeError will returned

delete element

not possible. TypeError will returned

tuples of dictionary

dict element can be changed inside tuple as they are mutable.

users = (
    {'name': 'John', 'age': 23},
    {'name': 'Jane', 'age': 25}
)

users[0]['age'] = 24

print(users)
# ({'name': 'John', 'age': 24}, {'name': 'Jane', 'age': 25})

non existance element

will return IndexError if you try to access non-existance element.

combine tuple

use + operator to combine tuple. it create new tuple but original tuple remained unchanged.

new_tuple = color + transport

print(new_tuple)
# ('red', 'green', 'blue', 'car', 'plane', 'train')

methods

just 2 methods

• count() - return the count of matched element.
• index() - return index of first matched element.

plane_count = transport.count('plane')
print(plane_count)
# 1

train_index = transport.index('train')
print(train_index)
# 2

what if I need to modify tuple?

first convert it to list, modify it, and then convert to tuple.

color_list = list(color)
color_list[1] = 'yellow'
color = tuple(color_list)
print(color)
# ('red', 'yellow', 'blue')