tuple() Function in Python

The Python tuple() function is a built-in function in Python that can be used to create a tuple. A tuple is an ordered and immutable sequence type.

Example:

l = [1,2,3]
print(tuple(l))

Output:

(1, 2, 3)

Python tuple() Syntax

Syntax: tuple(iterable)

• iterable (optional): It is an iterable(list, range etc..) or an iterator object
  •  If an iterable is passed, the corresponding tuple is created,
  • else, an empty tuple is created.

Return: Returns a Tuple

It raises a TypeError, if an iterable is not passed. Below programs illustrate tuple() function in Python.

tuple() in Python Function Examples

Create tuples using tuple()

In this example, we are creating a tuple() in Python and printing it.

# when parameter is not passed
tuple1 = tuple()
print("empty tuple:", tuple1)

# when an iterable(e.g., list) is passed
list1= [ 1, 2, 3, 4 ] 
tuple2 = tuple(list1)
print("list to tuple:", tuple2)

# when an iterable(e.g., string) is passed
string = "geeksforgeeks"; 
tuple4 = tuple(string)
print("str to tuple:", tuple4)

Output :

empty tuple: ()
list to tuple: (1, 2, 3, 4)
str to tuple: ('g', 'e', 'e', 'k', 's', 'f', 'o', 'r', 'g', 'e', 'e', 'k', 's')

Errors when using Tuple

Program demonstrating the TypeError using tuple()

# Python3 program demonstrating 
# the TypeError in tuple() function

# Error when a non-iterable is passed
tuple1 = tuple(1) 
print(tuple1)

Output :

Traceback (most recent call last):
  File "/home/eaf759787ade3942e8b9b436d6c60ab3.py", line 5, in 
    tuple1=tuple(1) 
TypeError: 'int' object is not iterable

Accessing Values in Tuples

In this example, we are creating a tuple and we are accessing the element from index 1 to 3.

my_tuple = (1, 2, 3, 4, 5)
print(my_tuple[1:4])  

Output :

(2, 3, 4)

Deleting a Tuple

In this example, we are creating a tuple and we are deleting it and after the deletion, we are trying to access the deleted tuple.

my_tuple = (1, 2, 3, 4, 5)
del my_tuple
print(my_tuple)

Output :

    print(my_tuple)
NameError: name 'my_tuple' is not defined

Creating a Tuple From dict

In this example, we are creating a dict and we then use the items() method of the dictionary to get a list of tuples, where each tuple contains a key-value from dict.

my_dict = {'apple': 1, 'banana': 2, 'cherry': 3}
my_tuple = tuple(my_dict.items())
print(my_tuple)  

Output :

(('apple', 1), ('banana', 2), ('cherry', 3))

Tuple() Built-In Functions

Here are some examples of built-in functions in tuples.

len() with Python Tuple

It returns the number of elements in a tuple.

my_tuple = tuple((1, 2, 3))
print(len(my_tuple))  

Output :

3

max() with Python Tuple

It returns the largest element in a tuple.

my_tuple = tuple((1, 2, 3))
print(max(my_tuple)) 

Output :

3

min() with Python Tuple

It returns the smallest element in a tuple.

my_tuple = tuple((1, 2, 3))
print(min(my_tuple))  

Output :

1

sum() with Python Tuple

It returns the sum of all the elements in a tuple.

my_tuple = tuple((1, 2, 3))
print(sum(my_tuple))  

Output :

6

sorted() with Python Tuple

It returns a new sorted list containing the elements of the tuple.

my_tuple = tuple((3, 2, 1))
sorted_tuple = tuple(sorted(my_tuple))
print(sorted_tuple) 

Output :

(1,2,3) 

Advantages Of Tuple Over List

Python supports both tuples and lists as data structures that may be used to hold a collection of data. Nevertheless, there are certain benefits to utilising tuples rather than lists.

• Tuples cannot be changed. 
• Tuples are faster than lists.
• Tuples can be used as dictionary keys.