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

Introduction to if-elif-else Statement

Let's begin by examining an example that will aid in a better understanding of the if-elif-else statement.

Here is an example where we check the age for several conditions.

Example 1:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
if age >= 18:
    print('Adult')
if age < 18 and age >= 10:
    print('Teenager')
if age < 10 and age >= 1:
    print('Child')
if age < 1 and age > 0:
    print('Baby')

If you need to execute one command from several options based on a condition, you can utilize the elif construct.

You can also include an else statement at the end, which will be executed if none of the preceding conditions are satisfied.

Let's consider the following illustration:

So let's rewrite the example above with the new elif statement.

Example 2:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
elif age >= 18:
    print('Adult')
elif age >= 10:
    print('Teenager')
elif age >= 1:
    print('Child')
else:
    print('Baby')

Clearly, the new operator works smoothly as intended.

Task

Swipe to show code editor

Now you can write the program which can determine the shape of the figure on the number of angles. Use the if-elif-else construction to solve this task.

We have the following classification:

0 angles -> Circle or ellipse;
3 angles -> Triangle;
4 angles -> Square, rectangle, or rhombus;
more than 4 angles -> Polygon;
in other cases -> It is not a geometric figure.

Please, fill in the gaps.

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 3. Chapter 1

Introduction to if-elif-else Statement

Let's begin by examining an example that will aid in a better understanding of the if-elif-else statement.

Here is an example where we check the age for several conditions.

Example 1:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
if age >= 18:
    print('Adult')
if age < 18 and age >= 10:
    print('Teenager')
if age < 10 and age >= 1:
    print('Child')
if age < 1 and age > 0:
    print('Baby')

If you need to execute one command from several options based on a condition, you can utilize the elif construct.

You can also include an else statement at the end, which will be executed if none of the preceding conditions are satisfied.

Let's consider the following illustration:

So let's rewrite the example above with the new elif statement.

Example 2:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
elif age >= 18:
    print('Adult')
elif age >= 10:
    print('Teenager')
elif age >= 1:
    print('Child')
else:
    print('Baby')

Clearly, the new operator works smoothly as intended.

Task

Swipe to show code editor

Now you can write the program which can determine the shape of the figure on the number of angles. Use the if-elif-else construction to solve this task.

We have the following classification:

0 angles -> Circle or ellipse;
3 angles -> Triangle;
4 angles -> Square, rectangle, or rhombus;
more than 4 angles -> Polygon;
in other cases -> It is not a geometric figure.

Please, fill in the gaps.

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 3. Chapter 1

Introduction to if-elif-else Statement

Let's begin by examining an example that will aid in a better understanding of the if-elif-else statement.

Here is an example where we check the age for several conditions.

Example 1:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
if age >= 18:
    print('Adult')
if age < 18 and age >= 10:
    print('Teenager')
if age < 10 and age >= 1:
    print('Child')
if age < 1 and age > 0:
    print('Baby')

If you need to execute one command from several options based on a condition, you can utilize the elif construct.

You can also include an else statement at the end, which will be executed if none of the preceding conditions are satisfied.

Let's consider the following illustration:

So let's rewrite the example above with the new elif statement.

Example 2:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
elif age >= 18:
    print('Adult')
elif age >= 10:
    print('Teenager')
elif age >= 1:
    print('Child')
else:
    print('Baby')

Clearly, the new operator works smoothly as intended.

Task

Swipe to show code editor

Now you can write the program which can determine the shape of the figure on the number of angles. Use the if-elif-else construction to solve this task.

We have the following classification:

0 angles -> Circle or ellipse;
3 angles -> Triangle;
4 angles -> Square, rectangle, or rhombus;
more than 4 angles -> Polygon;
in other cases -> It is not a geometric figure.

Please, fill in the gaps.

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

Everything was clear?

Thanks for your feedback!

Let's begin by examining an example that will aid in a better understanding of the if-elif-else statement.

Here is an example where we check the age for several conditions.

Example 1:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
if age >= 18:
    print('Adult')
if age < 18 and age >= 10:
    print('Teenager')
if age < 10 and age >= 1:
    print('Child')
if age < 1 and age > 0:
    print('Baby')

If you need to execute one command from several options based on a condition, you can utilize the elif construct.

You can also include an else statement at the end, which will be executed if none of the preceding conditions are satisfied.

Let's consider the following illustration:

So let's rewrite the example above with the new elif statement.

Example 2:


              123456789101112
            
age = 10

if age < 0:
    print('Age cannot be negative')
elif age >= 18:
    print('Adult')
elif age >= 10:
    print('Teenager')
elif age >= 1:
    print('Child')
else:
    print('Baby')

Clearly, the new operator works smoothly as intended.

Task

Swipe to show code editor

Now you can write the program which can determine the shape of the figure on the number of angles. Use the if-elif-else construction to solve this task.

We have the following classification:

0 angles -> Circle or ellipse;
3 angles -> Triangle;
4 angles -> Square, rectangle, or rhombus;
more than 4 angles -> Polygon;
in other cases -> It is not a geometric figure.

Please, fill in the gaps.

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

Section 3. Chapter 1

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