In this tutorial we will learn about the python list() method and its uses with examples.

Python list() Method

What is the Python list() Method?

The python list() method is used to create a list along with typecasting of the list.

A list is a python built-in data structure that is a collection of ordered and mutable objects. You can learn more about python lists from here(Link).

The syntax of python list() is:

list(iterable)

Python list() Parameters

The list() method takes only one parameter as argument:

  • iterable (optional) – an iterable object that can be a sequence or collection of objects. (that can include string, tuples, set, or dictionary)

Example 1: How to use the list() method in python?

# empty list
print(list())

# vowel string
vowel_string = 'aeiou'
print(list(vowel_string))

# vowel tuple
vowel_tuple = ('a', 'e', 'i', 'o', 'u')
print(list(vowel_tuple))

# vowel list
vowel_list = ['a', 'e', 'i', 'o', 'u']
print(list(vowel_list))

Output:

[]
['a', 'e', 'i', 'o', 'u']
['a', 'e', 'i', 'o', 'u']
['a', 'e', 'i', 'o', 'u']

Example 2: How to convert a dictionary to list using list() method?

# number list

fruits = {1 : 'banana',2 : 'mango',3 : 'apple'}
print(fruits)

fruits_list = list(fruits)
print(fruits_list)

Output:

{1: 'banana', 2: 'mango', 3: 'apple'}
[1, 2, 3]

When we try to convert a dictionary to a list, only keys will be the elements of the list. It will not take values in the list. Also, the order of the elements will be random.

Example 3: How to create an empty list in python?

#Empty List

lst = list()

print(lst)

#Check Type of Python
print(type(lst))

Output:

[]
<class 'list'>

Rules of list() method

  • If the list() method is passed without a parameter it will return an empty list.
  • Dictionary object will only return keys when passed in the list() method.
  • Only sequences or collections of objects can be used with the list() method.

 

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