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Python list() function

March 12, 2021 PYTHON FUNCTION 509

Lists are undoubtedly one of the most powerful and versatile objects in Python and the list() function can be used to create a list object.

Python list() Syntax

The syntax of list() method is as follows:

list([iterable])

list() Parameters

The list() method takes only a single argument:

  • iterable (optional) - This parameter refers to an object that can be a sequence such as a string, tuple, etc. or a collection such as a set, dictionary, etc. or any iterator object. 

list() Return Value

The list() method is basically a constructor and it returns a list. Based on the input parameters, there can be two type of return values from the list() method:

Return Value
Details
List of iterable items
If an iterable is passed as a parameter, a list containing iterable elements is returned.
Empty List
If no parameters are passed, an empty list is returned.

Python list() Examples

# list from string
st = "abc"
ls1 = list(st)
print(ls1)

# list from tuple
tup = ('d','e','f')
ls2 = list(tup)
print(ls2)

# list from dictionary
dic = {'g':1, 'h':2, 'i':3}
ls3 = list(dic)
print(ls3)

# empty dictionary
ls4 = list()
print(ls4)

Output:

['a', 'b', 'c']
['d', 'e', 'f']
['g', 'h', 'i']
[]

In this way we have seen the working of the Python list() function and how it can be used to convert an iterable or a sequence into a list object.


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