Python Tuples

A tuple is a Python sequence which stores a group of elements or items. Tuples are similar to lists but the main difference is tuples are immutable whereas lists are mutable. Since tuples are immutable, once we create a tuple we cannot modify its elements. Hence we cannot perform operations like append(), extend(), insert(), remove(), pop() and clear() on tuples. Tuples are generally used to store data which should not be modified and retrieve that data on demand.

Creating Tuples

We can create a tuple by writing elements separated by commas inside parentheses (). The elements can be of same datatype or different types. For example, to create an empty tuple, we can simply write empty parenthesis, as:

tup1 = () #empty tuple

If we want to create a tuple with only one element, we can mention that element in parentheses and after that a comma is needed, as:

tup2 = (10,)

Here is a tuple with different types of elements:

tup3 = (10, 20, -30.1, 40.5, 'Hyderabad', 'New Delhi')

We can create a tuple with only one of type of elements also, like the following:

tup4 = (10, 20, 30) #tuple with integers

If we do not mention any brackets and write the elements separating them by commas, then they are taken by default as a tuple. See the following example:

tup5 = 1, 2, 3, 4 #no braces

The point to remember is that if do not use any brackets, it will become a tuple and not a list or any other datatype.

It is also possible to create a tuple from a list. This is done by converting a list into a tuple using the tuple() function.

list = [1, 2, 3] #take a list

tpl = tuple(list) #convert list into tuple

print(tpl) #display tuple

Another way to create a tuple is by using range() function that returns a sequence.

tpl= tuple(range(4, 9, 2)) #numbers from 4 to 8 in steps of 2

print(tpl)

The preceding statements will give: (4, 6, 8)


Accessing the Tuple Elements:

Accessing the elements from a tuple can be done using indexing or slicing. This is same as that of a list.

tup = (50,60,70,80,90,100)

Indexing represents the position number of the element in the tuple. Now, tup[0] represents the 0th element, tup[1] represents the 1st element and so on.


print(tup[0])

The preceding will give: 50



print(tup[:])

print(tup[1:4])

print(tup[::2])

print(tup[-4:-1])

student = (10, 'Naresh kumar', 50,60,65,61,70)

rno, name = student[0:2]

print(rno, name)

marks = student[2:7]

for i in marks:

print(i)