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Python Tutorial for Beginners
course content

Course Content

Python Tutorial for Beginners

Python Tutorial for Beginners

1. Introduction to Programming
Writing Lines of CodeChallenge 1Challenge 2
2. Variables in Python
Variables for StringChallengeVariables for NumbersMath expressions: Familiar operatorsChallenge 1Challenge 2
3. Comments
CommentsChallenge 1Challenge 2
4. If...Else Statement
if statementComparison operatorsif-else and if-else-elif statementsChallenge 1Challenge 2

bookVariables for Numbers

But we can not only assign strings to a variable. You can also assign a number.


              
1

            
coins = 70
copy

After writing the code above, every time you call the coins variable in your code, Python will know that you mean 70. You can use this variable in math and more.

Let's see how to add 20 to this variable.


              
1

            
print(coins + 20)
copy

Python remembers that coins refers to 70, so it will return 90 (70 + 20 = 90).

Unlike a string, a number does not need to be quoted. This is how Python understands that it is a number with which it can calculate mathematical expressions, and not a text string.

Python can also perform calculations that consist only of variables. For example


              
1234

            
price_of_tangerines = 15
price_of_lemon = 7
total_price = price_of_tangerines + price_of_lemon
print(total_price)
copy

The variable total_price now has a value of 22.


              
12

            
original_number = 17
original_number = original_number + 8
copy

Let's look at very intresting example.


              
123

            
price_1 = "100"
new_price = price_1 + 17
print(new_price)
copy

This code throws an error because Python cannot sum a string and a number.

It's time to practice.

Task

Assign a number (35) to the variable number. Add 5 to the variable number and assign the result to the same variable. Display the result on the screen using print statement.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 3
toggle bottom row

bookVariables for Numbers

But we can not only assign strings to a variable. You can also assign a number.


              
1

            
coins = 70
copy

After writing the code above, every time you call the coins variable in your code, Python will know that you mean 70. You can use this variable in math and more.

Let's see how to add 20 to this variable.


              
1

            
print(coins + 20)
copy

Python remembers that coins refers to 70, so it will return 90 (70 + 20 = 90).

Unlike a string, a number does not need to be quoted. This is how Python understands that it is a number with which it can calculate mathematical expressions, and not a text string.

Python can also perform calculations that consist only of variables. For example


              
1234

            
price_of_tangerines = 15
price_of_lemon = 7
total_price = price_of_tangerines + price_of_lemon
print(total_price)
copy

The variable total_price now has a value of 22.


              
12

            
original_number = 17
original_number = original_number + 8
copy

Let's look at very intresting example.


              
123

            
price_1 = "100"
new_price = price_1 + 17
print(new_price)
copy

This code throws an error because Python cannot sum a string and a number.

It's time to practice.

Task

Assign a number (35) to the variable number. Add 5 to the variable number and assign the result to the same variable. Display the result on the screen using print statement.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 3
toggle bottom row

bookVariables for Numbers

But we can not only assign strings to a variable. You can also assign a number.


              
1

            
coins = 70
copy

After writing the code above, every time you call the coins variable in your code, Python will know that you mean 70. You can use this variable in math and more.

Let's see how to add 20 to this variable.


              
1

            
print(coins + 20)
copy

Python remembers that coins refers to 70, so it will return 90 (70 + 20 = 90).

Unlike a string, a number does not need to be quoted. This is how Python understands that it is a number with which it can calculate mathematical expressions, and not a text string.

Python can also perform calculations that consist only of variables. For example


              
1234

            
price_of_tangerines = 15
price_of_lemon = 7
total_price = price_of_tangerines + price_of_lemon
print(total_price)
copy

The variable total_price now has a value of 22.


              
12

            
original_number = 17
original_number = original_number + 8
copy

Let's look at very intresting example.


              
123

            
price_1 = "100"
new_price = price_1 + 17
print(new_price)
copy

This code throws an error because Python cannot sum a string and a number.

It's time to practice.

Task

Assign a number (35) to the variable number. Add 5 to the variable number and assign the result to the same variable. Display the result on the screen using print statement.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

But we can not only assign strings to a variable. You can also assign a number.


              
1

            
coins = 70
copy

After writing the code above, every time you call the coins variable in your code, Python will know that you mean 70. You can use this variable in math and more.

Let's see how to add 20 to this variable.


              
1

            
print(coins + 20)
copy

Python remembers that coins refers to 70, so it will return 90 (70 + 20 = 90).

Unlike a string, a number does not need to be quoted. This is how Python understands that it is a number with which it can calculate mathematical expressions, and not a text string.

Python can also perform calculations that consist only of variables. For example


              
1234

            
price_of_tangerines = 15
price_of_lemon = 7
total_price = price_of_tangerines + price_of_lemon
print(total_price)
copy

The variable total_price now has a value of 22.


              
12

            
original_number = 17
original_number = original_number + 8
copy

Let's look at very intresting example.


              
123

            
price_1 = "100"
new_price = price_1 + 17
print(new_price)
copy

This code throws an error because Python cannot sum a string and a number.

It's time to practice.

Task

Assign a number (35) to the variable number. Add 5 to the variable number and assign the result to the same variable. Display the result on the screen using print statement.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 2. Chapter 3
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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