Convert List of 1s and 0s to a List of booleans in Python

This tutorial will discuss about unique ways to convert list of 1s and 0s to a list of booleans in Python.

Table Of Contents

Introduction

Suppose we have a list of integers containing only 1s and 0s. Like this,

listOfNums = [1, 0, 1, 1, 0, 0, 0, 1]

Now we want to convert this list of 1s and 0s to a List of booleans. Like this,

[True, False, True, True, False, False, False, True]

• The 0 should be converted to False.
• The 1 should be converted to True.

Let’s how to do this.

Method 1: Using List Comprehension

Iterate over elements of list, inside a List Comprehension, and call the bool() method on each element or number in the list. The bool() method will convert number 0 to False, and any other number to True. The List comprehension, will returned a new list containing these converted boolean values.

Let’s see the complete example,

listOfNums = [1, 0, 1, 1, 0, 0, 0, 1]

# convert list of integers to list of bools
listOfBools = [bool(elem) for elem in listOfNums]

print(listOfBools)

Output

[True, False, True, True, False, False, False, True]

Method 2: Using NumPy Array

Create a NumPy Array from list of numbers, but pass the dtype as bool while constructing the NumPy Array. The array will have bools only i.e.

• The 0 will be converted to False.
• Anyother number will be converted to True.

Then convert this NumPy array to a list of booleans.

Let’s see the complete example,

import numpy as np

listOfNums = [1, 0, 1, 1, 0, 0, 0, 1]

# create a NumPy Array of bool type from list
arr = np.array(listOfNums, dtype=bool)

# Convert numpy rray of bools to a Boolean list
listOfBools = arr.tolist()

print(listOfBools)

Output

[True, False, True, True, False, False, False, True]

Summary

We learned about two different ways to convert a list of 1s and 0s to list of bools in Python.