python how to make a function

                                    def test_function(argument1,argument2,argument3) :
  # Do something with the code, and the arguments.
  print(argument1)
  print(argument2)
  print(argument3)
  
# Calling the function.

test_function('Hello','World','!')

# Output
'''
Hello
World
!
'''

                                    def greet(name):
    """
    This function greets to
    the person passed in as
    a parameter
    """
    print("Hello, " + name + ". Good morning!")

                                    #Functions
def string():
  print('This is a function')
  
  print(string())

                                    #Functions can be re used in programmes and can be extremely useful. 
#You would use functions a lot when you make programmes using packages such 
#as Tkinter, of which you will in the future.
#The Format:
#def [Whatever name you want]()      
#[The "()" at the end is compulsory as we are making a function.]

#Think of it like using an inbuilt function from python like .lower()


def greet():
	print("Hello!")
    
greet() #We are recalling the function by typing out its name and brackets


#This function will have something known as a parameter aka arguement
#This example will show a non changeable arguement unless coded


#Option 1, will directly print the sum:
def math(num1, num2):
	sum = num1+num2
	print(sum)

math(1, 2) #We change the num 1 and num 2 to the one and 2, though this can't change unless progammed to.

#Option 2, will return the sum and then print upon command.
def math(num1, num2):
  sum = num1+num2
  return sum

print(math(1, 2))

#Good luck to all my future Software engineers! Hope life treats you all well!
#Inshallah! (Meaning if Allah allows it!)

                                    def name():#name of the def(function);
  print("Hallo, World!")#Output is Hallo, World!;
  
name()#Name of the def, the programm will jump to the def;

#output:
#Hallo, World!