Python Beginner Tutorial # 7 : Function

Functions

are a block of code that only are execute when called. Functions have parameters that can be used to pass data.

Functions are created by using def keyword

def example_function():
  print("This is a function")

If you were to run this code above, nothing would be printed. In order for a function be executed it must be called. 

def example_function():
  print("This is a function")

# calling function 
example_function()
Output : 
This is a function

Parameters

are created after the functions has been named. Users can add as many parameters as needed.

For the example below there is one parameter it is called ( names )

def example_function(names):
  print(" Welcome!" + names)

example_function("Larry")
example_function("Curly")
example_function("Moe")
Output :
 Welcome!Larry
 Welcome!Curly
 Welcome!Moe

Multi parameter Function

Function can have multiple parameters. In the example below, the function customer has two parameters: firstName and number.

When the function is called it should produce the customer’s first name and the customer’s number. 

def customer(firstname, number):  
     print(firstName, number)  
    
                      
customer(firstName ='Mike', number ='234')     
customer(firstName ='Kelly', number ='235')
Output :
Mike 234
Kelly 235