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Learn Python from Scratch
course content

Course Content

Learn Python from Scratch

Learn Python from Scratch

1. The basics
Hello, World!Hello, me!VariablesCommentsIndentationNumbers and strings
2. Arithmetic operations
AdditionMultiplication and powerDivision and whole part division
3. Common data types
Data typesNumbersfloat and intStoring textStrings slicingConcatenation
4. Conditional statements
Boolean data typeCombining conditionsSimple if/else expressions (1/2)Simple if/else expressions (2/2)If/else expressions with multiple conditions (1/2)If/else expressions with multiple conditions (2/2)
5. Other data types
Lists (1/3)Lists (2/3)Lists (3/3)Tuples (1/3)Tuples (2/3)Tuples (3/3)Dictionaries (1/2)Dictionaries (2/2)
6. Loops
while loop (1/2)while loop (2/2)for loop (1/5)for loop (2/5)for loop (3/5)for loop (4/5)for loop (5/5)
7. Functions
Built-in functionsWriting your own functions (1/5)Writing your own functions (2/5)Writing your own functions (3/5)Writing your own functions (4/5)Writing your own functions (5/5)lambda functions

Writing your own functions (1/5)

In the previous examples (for example in the Conditional statements Section) we assigned different values to a variable just to check if our code works as we need. It might be uncomfortable, especially when your code is becoming larger and larger. This can be solved by using functions. To define function use syntax:


              
123

            
def name_of_function(var1, var2...):
  body of function
  return smth
copy

For example, let's define a simple function, which receives two numbers and returns their sum squared.


              
123456

            
# define function
def sum_squared(a, b):
  return (a+b)**2

# call function
print(sum_squared(2,3))
copy

Task

Define a function my_first_function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power. For example, for 5, 4, 3 it should return (5⋅3 + 4⋅2 + 3)^2 = 676. Test it on that numbers.

Task

Define a function my_first_function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power. For example, for 5, 4, 3 it should return (5⋅3 + 4⋅2 + 3)^2 = 676. Test it on that numbers.

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

Everything was clear?

Section 7. Chapter 2
toggle bottom row

Writing your own functions (1/5)

In the previous examples (for example in the Conditional statements Section) we assigned different values to a variable just to check if our code works as we need. It might be uncomfortable, especially when your code is becoming larger and larger. This can be solved by using functions. To define function use syntax:


              
123

            
def name_of_function(var1, var2...):
  body of function
  return smth
copy

For example, let's define a simple function, which receives two numbers and returns their sum squared.


              
123456

            
# define function
def sum_squared(a, b):
  return (a+b)**2

# call function
print(sum_squared(2,3))
copy

Task

Define a function my_first_function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power. For example, for 5, 4, 3 it should return (5⋅3 + 4⋅2 + 3)^2 = 676. Test it on that numbers.

Task

Define a function my_first_function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power. For example, for 5, 4, 3 it should return (5⋅3 + 4⋅2 + 3)^2 = 676. Test it on that numbers.

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

Everything was clear?

Section 7. Chapter 2
toggle bottom row

Writing your own functions (1/5)

In the previous examples (for example in the Conditional statements Section) we assigned different values to a variable just to check if our code works as we need. It might be uncomfortable, especially when your code is becoming larger and larger. This can be solved by using functions. To define function use syntax:


              
123

            
def name_of_function(var1, var2...):
  body of function
  return smth
copy

For example, let's define a simple function, which receives two numbers and returns their sum squared.


              
123456

            
# define function
def sum_squared(a, b):
  return (a+b)**2

# call function
print(sum_squared(2,3))
copy

Task

Define a function my_first_function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power. For example, for 5, 4, 3 it should return (5⋅3 + 4⋅2 + 3)^2 = 676. Test it on that numbers.

Task

Define a function my_first_function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power. For example, for 5, 4, 3 it should return (5⋅3 + 4⋅2 + 3)^2 = 676. Test it on that numbers.

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

Everything was clear?

In the previous examples (for example in the Conditional statements Section) we assigned different values to a variable just to check if our code works as we need. It might be uncomfortable, especially when your code is becoming larger and larger. This can be solved by using functions. To define function use syntax:


              
123

            
def name_of_function(var1, var2...):
  body of function
  return smth
copy

For example, let's define a simple function, which receives two numbers and returns their sum squared.


              
123456

            
# define function
def sum_squared(a, b):
  return (a+b)**2

# call function
print(sum_squared(2,3))
copy

Task

Define a function my_first_function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power. For example, for 5, 4, 3 it should return (5⋅3 + 4⋅2 + 3)^2 = 676. Test it on that numbers.

Switch to desktop for real-world practiceContinue from where you are using one of the options below
Section 7. Chapter 2
Switch to desktop for real-world practiceContinue from where you are using one of the options below
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