Create Empty List with certain size in Python

In this article, we will discuss different ways to create an empty list with certain size.

Table Of Contents

Introduction

An empty list of size N means, that list will contain N None values. For example, an empty list of size 5 is,

emptyList = [None, None, None, None, None] 

There are different ways to create a list of given size and with None values only. Let’s discuss them one by one.

Create an empty list with certain size using astrik

First, create a list with one None value only, and then multiply that with N. Where, N is the size of empty list. It will give us a list with N None values. for example,

N = 5

# Create an empty List of size N
emptyList = [None] * N

print(emptyList)

Ouput:

[None, None, None, None, None]

It created a list of 5 None values.

Create an empty list with certain size using List Comprehension

Inside a List comprehension, iterate from 0 till N and add None to a list. Where, N is the size of empty list. It will give us a list with N None values. For example,

N = 5

# Create an empty List of size N
emptyList = [None for i in range(N) ]

print(emptyList)

Ouput:

[None, None, None, None, None]

It created a list of 5 None values.

Summary

We learned how to create an empty list of given size in Python. Thanks.