Python tuple() Function Explained

The built-in tuple() function creates a tuple in Python.

You can use it in two main ways:

tuple() creates an empty tuple
tuple(iterable) converts an iterable into a tuple

This is useful when you want a fixed, immutable sequence of values. Beginners often use tuple() to convert a list, string, range, or other iterable into a tuple.

Quick example

numbers = [1, 2, 3]
result = tuple(numbers)

print(result)
print(type(result))

Output:

(1, 2, 3)
<class 'tuple'>

Use tuple(iterable) to convert an iterable like a list, string, or range into a tuple.

What tuple() does

tuple() is a built-in Python function.

It:

creates a tuple object
can make an empty tuple with no arguments
can convert another iterable into a tuple

If you are new to tuples, see what is a tuple in Python or the full guide to Python tuples explained.

Basic syntax

There are two common forms:

tuple()
tuple(iterable)

Important points:

The argument must be an iterable
Common iterables include:
- lists
- strings
- ranges
- sets
- dictionaries

An iterable is a value Python can go through one item at a time.

Create an empty tuple

Calling tuple() with no argument returns an empty tuple.

empty = tuple()

print(empty)
print(type(empty))

Output:

()
<class 'tuple'>

This is equivalent to:

empty = ()

Convert common iterables to a tuple

List to tuple

A list keeps its item order when converted to a tuple.

numbers = [10, 20, 30]
result = tuple(numbers)

print(result)

Output:

(10, 20, 30)

If you need a changeable sequence instead, see the Python list() function explained.

String to tuple

A string is iterable, so each character becomes a separate item.

text = "cat"
result = tuple(text)

print(result)

Output:

('c', 'a', 't')

This often surprises beginners. tuple("cat") does not create ('cat',).

Range to tuple

range() produces values one at a time, and tuple() collects them all.

result = tuple(range(5))

print(result)

Output:

(0, 1, 2, 3, 4)

Set to tuple

A set can also be converted to a tuple.

values = {1, 2, 3}
result = tuple(values)

print(result)

Output:

(1, 2, 3)

The order may not be predictable, because sets do not store items in a fixed order. If you want to understand sets better, see the Python set() function explained.

Dictionary to tuple

When you pass a dictionary to tuple(), Python uses the dictionary's keys.

person = {"name": "Ana", "age": 25}
result = tuple(person)

print(result)

Possible output:

('name', 'age')

What happens with dictionaries

This is a common beginner surprise.

tuple(my_dict) returns a tuple of dictionary keys, not key-value pairs.

person = {"name": "Ana", "age": 25}

print(tuple(person))
print(tuple(person.items()))

Output:

('name', 'age')
(('name', 'Ana'), ('age', 25))

Use:

tuple(my_dict) for keys
tuple(my_dict.items()) for key-value pairs

This happens because iterating over a dictionary gives its keys by default. You can learn more in the Python dict() function explained.

When to use tuple()

tuple() is a good choice when:

you need an immutable sequence
you want to convert a list into a tuple
you want to store a fixed group of values
you have data that should not be changed later

Example:

coordinates = tuple([4, 7])
print(coordinates)

Output:

(4, 7)

Tuples are often used for values like:

coordinates
RGB colors
dates
settings that should stay fixed

When not to use tuple()

Do not use tuple() when:

you need to add, remove, or update items later
a list would be easier to work with
you are passing a non-iterable value

For example, this does not work:

tuple(5)

An integer is not iterable, so Python raises an error.

If you need a flexible sequence, use a list instead of a tuple.

Common errors and confusion

Here are some common problems beginners run into.

Passing a non-iterable value

This causes an error:

tuple(5)

Error:

TypeError: 'int' object is not iterable

If you see this, read TypeError: int object is not iterable.

Expecting one whole string item

This code:

tuple("hello")

returns:

('h', 'e', 'l', 'l', 'o')

It does not return:

('hello',)

If you want a one-item tuple, write:

single = ("hello",)
print(single)

Expecting dictionary values too

This code:

data = {"a": 1, "b": 2}
print(tuple(data))

returns only the keys:

('a', 'b')

To get key-value pairs, use:

print(tuple(data.items()))

Thinking parentheses always convert to a tuple

Parentheses can create tuples in many cases, but they do not behave the same as tuple() conversion.

For example:

value = (1, 2, 3)
print(value)

This creates a tuple directly.

But tuple() is specifically used to create an empty tuple or convert an iterable into a tuple.

FAQ

What does tuple() do in Python?

It creates a tuple. With an iterable argument, it converts that iterable into a tuple.

What does tuple() return with no argument?

It returns an empty tuple: ().

Can tuple() convert a string?

Yes. Each character becomes a separate item in the tuple.

Why does tuple(my_dict) only return keys?

Iterating over a dictionary gives its keys by default.

Can I use tuple() on an integer?

No. An integer is not iterable, so Python raises a TypeError.