Logical Operators Part 2

Part of the Fundamentals section of Coddy's Python journey — lesson 16 of 77.

Logical operators have a special table called "Truth table" that shows what the combination of logical operators returns.

Truth table for the and operator:

a	b	a and b
False	False	False
False	True	False
True	False	False
True	True	True

The only way to get a True for the and operator is if both a and b are True

Truth table for the or operator:

a	b	a or b
False	False	False
False	True	True
True	False	True
True	True	True

In this case, to get a True result, either a or b should be True.

Truth table for the not operator:

a	not a
False	True
True	False

Here the value of a is reversed. If a is False then not a is True

Challenge

Beginner

Replace the values of variables b1 and b2 with numbers so that b3 evaluates to True.

b3 will be True when the multiplication of b1 and b2 is greater than their addition.

Cheat sheet

Truth tables for logical operators in Python:

AND Operator

a	b	a and b
False	False	False
False	True	False
True	False	False
True	True	True

OR Operator

a	b	a or b
False	False	False
False	True	True
True	False	True
True	True	True

NOT Operator

a	not a
False	True
True	False

Try it yourself

# Replace the values with numbers
b1 = ?
b2 = ?

# This line checks if b1 * b2 is greater than b1 + b2
b3 = (b1 * b2) > (b1 + b2)

# Don't change the line below
print(f"b3 = {b3}")

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments

4Operators Part 2

Logical Operators Part 1Logical Operators Part 2Recap - Simple Logic Logical Operators Part 3 Logical Operators Part 4

7Bill Split Calculator

Welcome Message Getting Input

Calculating The Tip And Total

Splitting The Bill

Formatted Output

10FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

13Lists Advanced

List Slicing Part 1 List Slicing Part 2 Sequence Operators Membership

3Operators Part 1

Arithmetic Operators Modulo Operator Arithmetic Shortcuts Recap - Simple Math Comparison Operators

6Basic IO

Output Output With Variables Input Cast Recap - Till 120 Recap - True or False

9Functions

Declare a Function Arguments Return Recap - Sigma Function Recap - Validation Function Default Values

12Iterating Over Sequences

Iterating Over Elements The Enumerate Function Iterating Over Strings Part 1 Iterating Over Strings Part 2

15Final Challenges

Flat Asterisk Pyramid Pattern Finder What To Buy