Class 12 | Revision Tour 8

Tuple

A tuple is a sequence of python immutable objects. It is enclosed within parenthesis ().

Creating a tuple

>>> tup1=(1,2,3,4)
>>> tup1
(1, 2, 3, 4)

Accessing tuple items

Items of tuple can be accessed through index.

Example

>>> tup1=('red','blue','green','yellow')
>>> tup1[2]

Output
‘green’

Items of tuple can also be accessed through negative index.

Example

>>> tup1=('red','blue','green','yellow')
>>> tup1[-1]

Output
‘yellow’

Items of tuple can also be accessed through range of index.

Example

>>> tup1='red','blue','green','yellow','orange','brown')
>>> tup1[2:4]
>>> tup1[-5:-2]
>>> tup1[-3:]
>>> tup1[:4]
>>> tup1[0:4:2]

Output
(‘green’, ‘yellow’)
(‘blue’, ‘green’, ‘yellow’)
(‘yellow’, ‘orange’, ‘brown’)
(‘red’, ‘blue’, ‘green’, ‘yellow’)
(‘red’, ‘green’)

Iteration through a tuple

We can access elements of a tuple using loop.

Example 1:

tup1=(1,2,3,4,5,6,7,8,9,10)
for i in tup1:
print(i)

Example 2: using range() function

tup1=(1,2,3,4,5,6,7,8,9,10)
for i in range(len(tup1)):
print(tup1[i])

Concatenation of tuple

We can add two tuples with ‘+’ operator.

Example:

>>> t1=(1,2,3,4)
>>> t2=('a','b','c')
>>> t1+t2

Output
(1, 2, 3, 4, ‘a’, ‘b’, ‘c’)

Repetition of tuple

We can use ‘*’ to multiply the tuple number of times.

Example:

>>> t1=(1,2,3,4)
>>> t1*3

Output
(1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4)

Membership

We can use ‘in’ to check whether the specified element is present in the tuple or not.

Example:

>>> t1=(1,2,3,4)
>>> 5 in t1

Output
False

Creating tuple with one item

To create a tuple with only one item, you have add a comma after the item, unless Python will not recognize the variable as a tuple.

Example
>>> tup1=(‘orange’,)
>>> print(type(tup1))
<class ‘tuple’>

Example
>>> tup1=(‘orange’)
>>> print(type(tup1))
<class ‘str’>

Tuple functions

Function	Description	Example
len(tuple)	Returns total no of items in the tuple	>>>tup=(‘a’,’b’,’c’) >>>print(len(tup)) 3
max(tuple)	Returns the item with largest value in the tuple	>>> tup=(2,60,455,120,3,5) >>> print(max(tup)) 455
min(tuple)	Returns the item with smallest value in the tuple	>>> tup=(2,60,455,120,3,5) >>> print(min(tup)) 2
tuple(seq)	Converts a list or string into a tuple	>>> str=”hello” >>> t=tuple(str) >>> t (‘h’, ‘e’, ‘l’, ‘l’, ‘o’)

Tuple Methods

Python has two built-in methods that you can use on tuples.

count()	Returns the number of elements with the specified value	>>> t1=(1,2,3,1,4,5,1,6,1,8) >>> t1.count(1) 4
index()	Returns the index of the first element with the specified value	>>> t1.index(4) 4

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