Python list() Function

Python list() function takes any iterable as a parameter and returns a list. In Python iterable is the object you can iterate over. Some examples of iterables are tuples, strings, and lists.

Python list() Function Syntax

Syntax: list(iterable)

Parameter:

• iterable:  an object that could be a sequence (string, tuples) or collection (set, dictionary) or any iterator object.

Note: If we don’t pass any parameter then the list() function will return a list with zero elements (empty list).

list() Function in Python

We can create a Python list by using list() function. Below are the ways by which we can use list() function in Python:

• To create a list from a string
• To create a list from a tuple
• To create a list from set and dictionary
• Taking user input as a list

Example 1: Using list() to Create a List from a String

In this example, we are using list() function to create a Python list from a string.

Python3

# initializing a string
string = "ABCDEF"

# using list() function to create a list
list1 = list(string)

# printing list1
print(list1)

Output

['A', 'B', 'C', 'D', 'E', 'F']

Example 2: Using list() to Create a List from a Tuple

In this example, we are using list() function to create a Python list from a Tuple.

Python3

# initializing a tuple
tuple1 = ('A', 'B', 'C', 'D', 'E')

# using list() function to create a list
list1 = list(tuple1)

# printing list1
print(list1)

Output

['A', 'B', 'C', 'D', 'E']

Example 3: Using list() to Create a List from Set and Dictionary

In this example, we are using list() function to create a Python list from set and dictionary.

Python3

# initializing a set
set1 = {'A', 'B', 'C', 'D', 'E'}

# initializing a dictionary
dictionary = {'A': 1, 'B': 2, 'C': 3, 'D': 4, 'E': 5}

# using list() to create a list
list1 = list(set1)
list2 = list(dictionary)

# printing
print(list1)
print(list2)

Output

['A', 'C', 'B', 'E', 'D']
['A', 'C', 'B', 'E', 'D']

We can also use list() function while taking input from user to directly take input in form of a list.

Example 4: Taking User Input as a List

In this example, we are using list() function to take user input from the user and create a Python list from that input.

Python3

# Taking input from user as list
list1 = list(input("Please Enter List Elements: "))

# printing
print(list1)

Output

Please Enter List Elements: 12345
['1', '2', '3', '4', '5']