Python Tuples

A tuple in Python is an immutable ordered collection of elements.

• Tuples are similar to lists, but unlike lists, they cannot be changed after their creation (i.e., they are immutable).
• Tuples can hold elements of different data types.
• The main characteristics of tuples are being ordered , heterogeneous and immutable.

Creating a Tuple

A tuple is created by placing all the items inside parentheses (), separated by commas. A tuple can have any number of items and they can be of different data types.

Example:

tup = ()
print(tup)
# Using String
tup = ('Geeks', 'For')
print(tup)
# Using List
li = [1, 2, 4, 5, 6]
print(tuple(li))
# Using Built-in Function
tup = tuple('Geeks')
print(tup)

()
('Geeks', 'For')
(1, 2, 4, 5, 6)
('G', 'e', 'e', 'k', 's')

Let's understand tuple in detail:

Creating a Tuple with Mixed Datatypes.

Tuples can contain elements of various data types, including other tuples, lists, dictionaries and even functions.

Example:

tup = (5, 'Welcome', 7, 'Geeks')
print(tup)
# Creating a Tuple with nested tuples
tup1 = (0, 1, 2, 3)
tup2 = ('python', 'geek')
tup3 = (tup1, tup2)
print(tup3)
# Creating a Tuple with repetition
tup1 = ('Geeks',) * 3
print(tup1)
# Creating a Tuple with the use of loop
tup = ('Geeks')
n = 5
for i in range(int(n)):
    tup = (tup,)
    print(tup)

(5, 'Welcome', 7, 'Geeks')
((0, 1, 2, 3), ('python', 'geek'))
('Geeks', 'Geeks', 'Geeks')
('Geeks',)
(('Geeks',),)
((('Geeks',),),)
(((('Geeks',),),),)
((((('Geeks',),),),),)

Python Tuple Basic Operations

Below are the Python tuple operations.

• Accessing of Python Tuples
• Concatenation of Tuples
• Slicing of Tuple
• Deleting a Tuple

Accessing of Tuples

We can access the elements of a tuple by using indexing and slicing, similar to how we access elements in a list. Indexing starts at 0 for the first element and goes up to n-1, where n is the number of elements in the tuple. Negative indexing starts from -1 for the last element and goes backward.

Example:

# Accessing Tuple with Indexing
tup = tuple("Geeks")
print(tup[0])
# Accessing a range of elements using slicing
print(tup[1:4])  
print(tup[:3])
# Tuple unpacking
tup = ("Geeks", "For", "Geeks")
# This line unpack values of Tuple1
a, b, c = tup
print(a)
print(b)
print(c)

G
('e', 'e', 'k')
('G', 'e', 'e')
Geeks
For
Geeks

Concatenation of Tuples

Tuples can be concatenated using the + operator. This operation combines two or more tuples to create a new tuple.

Note: Only the same datatypes can be combined with concatenation, an error arises if a list and a tuple are combined. 

tup1 = (0, 1, 2, 3)
tup2 = ('Geeks', 'For', 'Geeks')
tup3 = tup1 + tup2
print(tup3)

(0, 1, 2, 3, 'Geeks', 'For', 'Geeks')

Slicing of Tuple

Slicing a tuple means creating a new tuple from a subset of elements of the original tuple. The slicing syntax is tuple[start:stop:step].

Note- Negative Increment values can also be used to reverse the sequence of Tuples. 

tup = tuple('GEEKSFORGEEKS')
# Removing First element
print(tup[1:])
# Reversing the Tuple
print(tup[::-1])
# Printing elements of a Range
print(tup[4:9])

('E', 'E', 'K', 'S', 'F', 'O', 'R', 'G', 'E', 'E', 'K', 'S')
('S', 'K', 'E', 'E', 'G', 'R', 'O', 'F', 'S', 'K', 'E', 'E', 'G')
('S', 'F', 'O', 'R', 'G')

Deleting a Tuple

Since tuples are immutable, we cannot delete individual elements of a tuple. However, we can delete an entire tuple using del statement.

Note: Printing of Tuple after deletion results in an Error. 

tup = (0, 1, 2, 3, 4)
del tup
print(tup)

Output

ERROR!
Traceback (most recent call last):
File "<main.py>", line 6, in <module>
NameError: name 'tup' is not defined

Tuple Unpacking with Asterisk (*)

In Python, the " * " operator can be used in tuple unpacking to grab multiple items into a list. This is useful when you want to extract just a few specific elements and collect the rest together.

tup = (1, 2, 3, 4, 5)
a, *b, c = tup
print(a) 
print(b) 
print(c)  

1
[2, 3, 4]
5

Explanation:

• a gets the first item.
• c gets the last item.
• *b collects everything in between into a list.

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Suggested Quiz

10 Questions

How to create an empty tuple in Python?

• A

  tup = ()

• B

  tup = tuple()

• C

  tup = []

• D

  Both A and B

Explanation:

Both () and tuple() create an empty tuple in Python.

What is the output of (1, 2, 3) + (4, 5, 6)?

• A

  (1, 2, 3, 4, 5, 6)

• B

  (5, 7, 9)

• C

  TypeError

• D

  (1, 2, 3, (4, 5, 6))

Explanation:

The + operator concatenates tuples.

How can you access the second element of the tuple t = (1, 2, 3)?

• A

  t[1]

• B

  t[2]

• C

  t.get(1)

• D

  t(1)

Explanation:

Tuple indices start from 0, so t[1] refers to the second element.

What is the output of ('repeat',) * 3?

• A

  ('repeat', 'repeat', 'repeat')

• B

  (repeat, repeat, repeat)

• C

  TypeError

• D

  ('repeatrepeatrepeat',)

Explanation:

Multiplying a tuple repeats its content.

Which of the following is true for the tuple t = (1, 2, [3, 4])?

• A

  Tuples cannot contain mutable objects like lists.

• B

  t[2][0] = 5 is a valid operation.

• C

  Tuples can be resized.

• D

  Tuples can only contain integers.

Explanation:

While tuples themselves are immutable, they can contain mutable objects like lists.

What happens if we try to assign a value to an element in a tuple?

• A

  The tuple is updated.

• B

  Nothing happens.

• C

  An error is raised.

• D

  The tuple is converted to a list.

Explanation:

Tuples are immutable, so attempting to change an element raises a TypeError.

Which of the following methods is not available for tuples?

• A

  .count()

• B

  .index()

• C

  .sort()

• D

  .reverse()

Explanation:

Tuples cannot be sorted in-place because they are immutable; hence no .sort() method.

Which of the following is a correct statement about tuple unpacking?

• A

  x, y, z = (1, 2, 3) is an invalid statement.

• B

  Tuple unpacking requires more variables than the elements in the tuple.

• C

  Tuple unpacking can be done without matching the exact number of elements

• D

  x, y, z = (1, 2, 3) unpacks the values into x, y, and z

Explanation:

Tuple unpacking assigns each element of a tuple to a variable provided they match in quantity.

What is the output of tuple(map(lambda x: x*x, [1, 2, 3]))?

• A

  [1, 4, 9]

• B

  (1, 4, 9)

• C

  {1, 4, 9}

• D

  None

Explanation:

The map() function applies a function to every item of an iterable and tuple() converts the result to a tuple.

What does the following tuple comprehension do? tuple(x for x in range(5))

• A

  Creates a tuple with elements 0 to 4.

• B

  Generates an error.

• C

  Creates a list instead of a tuple.

• D

  None of the above.

Explanation:

This is a generator expression passed to the tuple() constructor, which creates a tuple containing numbers from 0 to 4.

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