Tuples

Introduction:

• A tuple is used to store sequence of items
• A tuple consists of items separated by commas
• Tuples are enclosed within parentheses rather than within square brackets
• A tuple is an immutable list i.e., once a tuple is created, one can’t add elements to a tuple or remove elements from the tuple
• Values in the tuple can be accessed by their index values.

Advantages

• Tuples are immutable i.e.; it is impossible to add / delete elements to / from a tuple
• Tuples are faster than lists, because they have a constant set of values
• Tuples can be used as dictionary keys, because they contain immutable values like strings, numbers

Creating a tuple

• To create a tuple, all the items are placed inside parentheses separated by commas and assigned to a variable
• The parenthesis, at the time of creating a tuple is not necessary but it is good to use parenthesis
• Tuples can have any number of data items (integer, float, string, list etc.)
• While creating a tuple with one element, add a final comma after the item or element in order to complete the assignment of the tuple

Tuple with integer data items

>>> ituple=(1,0,4,9,2)
>>> ituple
(1, 0, 4, 9, 2)

Tuple with items of different data items

>>> first_tuple =(1,"one",2.0,"three")
>>> print (first_tuple)
(1, 'one', 2.0, 'three')

Nested tuple

>>> ntuple = (3,2,4,[1,2.2],[4,5,6])
>>> ntuple
(3, 2, 4, [1, 2.2], [4, 5, 6])

Tuple can be created without parentheses

>>> wptuple= 4,5,6
>>> wptuple
(4, 5, 6)

Tuple with one item

>>> otuple=1
>>> type(otuple)
<class 'int'>
>>> otuple = 1,
>>> type(otuple)
<class 'tuple'>

Accessing values in tuples

Using Square brackets

Accessing the values in a tuple using the index number enclosed in square brackets along with the name of tuple

>>> first_tuple =(1,"one",2.0,"three")
>>> print(first_tuple[0])
1
>>> print(first_tuple[3])
three
>>> first_tuple[-1]
'three'

Using slicing operator

Slicing print the continuous value in tuple

>>> print(first_tuple[1:3])
('one', 2.0)
>>> first_tuple[-3:-1]
('one', 2.0)
>>> first_tuple[-4:-1:1]
(1, 'one', 2.0)
>>> first_tuple[-4:-1:2]
(1, 2.0)
>>> first_tuple[-1:-4:-2]
('three', 'one')
>>> print(first_tuple[-4:])
(1, 'one', 2.0, 'three')
>>> print(first_tuple[-4:-2])
(1, 'one')

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