Course Content

Conditional Statements in Python

1. Python if Statement

Introduction to if Statement Syntax of if Statement Challenge: Mario Comparison Operators Logical Operators Operators Precendence

2. Python if-else Statement

Introduction to if-else Statement Syntax of if-else Statement Challenge: Geometric Figure Challenge: Rock, Paper and Scissors

3. Python if-elif-else Statement

Introduction to if-elif-else Statement Challenge: Car Brands Challenge: Ordinal Adjectives Challenge: Music Playlist Generator

4. Python Ternary Operator

Conditional Expression Challenge: Discount Calculator Challenge: Password Strength

Comparison Operators

Now, let's get into the details of what you can actually include within those conditions.

Comparison operators are useful for assessing the values of variables. Their result is always a boolean value, which can be either True or False.

== equal;

Note

There are two equal signs here because a single equal sign (=) has a completely different meaning. It is used for assignment and cannot (and does not make sense) to be used in if blocks.

!= not equal;
> greater than;
< less than;
>= greater than or equal;
<= less than or equal.

You can compare complex mathematical expressions, elements of different data structures, strings, and even boolean values. Look at the next examples:

Example 1:


              12345678
            
import math

#BMI = Weight(in kg) / Height^2 (in meters)
weight = 65
height = 1.70

if weight / math.pow(height, 2) <= 24.9:
    print('BMI: Healthy Weight')

Example 2:


              1234
            
string_1 = 'Netherlands'
string_2 = 'Switzerland'
if len(string_1) == len(string_2):
    print('These lines are the same length.')

Example 3:


              12
            
if True != False:
    print('These boolean values are not equal.')

Task

Swipe to show code editor

We have a variable month which can be a number from 1 to 12. You have tо determine what time of the year this month falls on (winter, spring, summer or autumn). In this task, you have to implement 4 if-statement. Note that we divide the quarters as follows:

spring 3 <= month < 6, in such case print such text: It is spring.;
summer 6 <= month < 9, in such case print such text: It is summer.;
autumn 9 <= month < 12, in such case print such text: It is autumn.;
winter month = 1 or month = 2 or month = 12, in such case print such text: It is winter..

Note

To include multiple conditions within a single if statement, you can use logical operators. You will learn more about these in the upcoming two chapters. For now, just use the or operator to combine two or more conditions together.

Fill in the blanks.

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Section 1. Chapter 4

Comparison Operators

Now, let's get into the details of what you can actually include within those conditions.

Comparison operators are useful for assessing the values of variables. Their result is always a boolean value, which can be either True or False.

== equal;

Note

There are two equal signs here because a single equal sign (=) has a completely different meaning. It is used for assignment and cannot (and does not make sense) to be used in if blocks.

!= not equal;
> greater than;
< less than;
>= greater than or equal;
<= less than or equal.

You can compare complex mathematical expressions, elements of different data structures, strings, and even boolean values. Look at the next examples:

Example 1:


              12345678
            
import math

#BMI = Weight(in kg) / Height^2 (in meters)
weight = 65
height = 1.70

if weight / math.pow(height, 2) <= 24.9:
    print('BMI: Healthy Weight')

Example 2:


              1234
            
string_1 = 'Netherlands'
string_2 = 'Switzerland'
if len(string_1) == len(string_2):
    print('These lines are the same length.')

Example 3:


              12
            
if True != False:
    print('These boolean values are not equal.')

Task

Swipe to show code editor

spring 3 <= month < 6, in such case print such text: It is spring.;
summer 6 <= month < 9, in such case print such text: It is summer.;
autumn 9 <= month < 12, in such case print such text: It is autumn.;
winter month = 1 or month = 2 or month = 12, in such case print such text: It is winter..

Note

To include multiple conditions within a single if statement, you can use logical operators. You will learn more about these in the upcoming two chapters. For now, just use the or operator to combine two or more conditions together.

Fill in the blanks.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 4

Switch to desktop for real-world practiceContinue from where you are using one of the options below