Single-element tuples in Python

09 of september of 2024

Single Element Tuples

Disclaimer: This post has been translated to English using a machine translation model. Please, let me know if you find any mistakes.

If in Python we want to create a list with a single element, we simply write the element between square brackets, for example:

	
		list = [1]
type(list)

	
		list

However, with tuples we cannot write an element within parentheses

	
		tupla = (1)
type(tupla)

int

As we can see, Python interprets it as an integer, not as a tuple. To solve this, a comma is added after the element, for example:

	
		tupla = (1,)
type(tupla)

	
		tuple

What is this for? When we have a function that returns several parameters, what it is actually returning is a tuple. So, it may happen that we have a code that calls a function, checks the length of the returned tuple, and processes each element of the tuple. Let's look at an example

	
		def return_tuple():
    return 1, 2, 3
def process_tuple():
    tuple = return_tuple()
    for i in tuple:
        print(i)
process_tuple()

But, what happens in this example if the function doesn't return a tuple? We would get an error

	
		def return_int():
    return 1
def process_tuple():
    tuple = return_int()
    for i in tuple:
        print(i)
process_tuple()

	
		---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[5], line 9
      6     for i in tuple:
      7         print(i)
----> 9 process_tuple()
Cell In[5], line 6, in process_tuple()
      4 def process_tuple():
      5     tuple = return_int()
----> 6     for i in tuple:
      7         print(i)
TypeError: 'int' object is not iterable

We get an error because Python tries to iterate through what the function returns, but since it returns an integer it can't iterate through it. We have two ways to solve this, one is that the processing function checks if a tuple has been returned and in that case processes it, another is that the function that returns values always returns a tuple, even if it is a single element.

	
		def return_int():
    return 1,
def process_tuple():
    tuple = return_int()
    for i in tuple:
        print(i)
process_tuple()

As we see, in the return_int function a , has been placed at the end of the return, so it is returning a tuple with a single element, which is why the process_tuple function will not give an error.

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