Python list() Function (original) (raw)

Last Updated : 04 Mar, 2025

list() function in Python is used to create lists from iterable objects. An iterable is an object that can be looped over, such as strings, tuples, sets, dictionaries and other collections. The function provides a convenient way to convert these objects into lists, making it easier to manipulate and process their elements. Example:

Python `

s = "Python"

Using list()

res = list(s) print(res)

`

Output

['P', 'y', 't', 'h', 'o', 'n']

**Explanation: String “Python” has six characters. list(s) converts it into [‘P’, ‘y’, ‘t’, ‘h’, ‘o’, ‘n’] by iterating through each character.

list() syntax

list(iterable)

**Parameters:

• **iterable (optional): An iterable object (such as a string, tuple, set, dictionary, or another iterator) that is converted into a list.
• If no argument is passed, it returns an empty list: [].

**Returns: Returns a new list containing elements from the given iterable.

Examples of list()

**Examples 1: Creating a list from a tuple

Python `

tup = (10, 20, 30, 40)

converting tuple to list

res = list(tup) print(res)

`

**Explanation: Tuple tup has four elements. **list(tup) converts it into [10, 20, 30, 40] by iterating through each element.

**Example 2: Creating a List from a Set

Python `

a = {1, 2, 3, 4, 5}

converting set to list

res = list(a) print(res)

`

**Explanation: Set **a has five elements. **list(a) converts it into a list, but the order may vary since sets are unordered.

**Example 3: Creating a list from a dictionary

Python `

d = {'A': 10, 'B': 20, 'C': 30}

Converting dictionary to list

res = list(d) print(res)

`

**Explanation: dictionary **d has three key-value pairs. **list(d) converts it into [‘A’, ‘B’, ‘C’], as **list() extracts only the dictionary keys.

**Example 4: Taking user inputs as a list

Python `

taking user input

a = list(input("Enter list elements: "))

print(a)

`

**Output

Enter list elements: Hello
['H', 'e', 'l', 'l', 'o']

**Explanation: This code takes user input as a string and converts it into a list of individual characters using list().