# declare a function

def function_name(param) :

  # content inside a function

​

function_name(param) # calling function

# In here im giving examples on how the def function works in python. 

# Each example is separated by ===

​

def functionName():

    # What to make the function do

==================================================================

​

def myfunction():

    print("Hello World")

myfunction()

​

==================================================================

​

def subtractNum():

    print(34 - 4)

​

subtractNum()

# Output: 30

==================================================================

​

def functionName(arg1, arg2):

    # What to do with function

functionName(valueForArg1, valueForArg2)

​

==================================================================

def addNum(num1, num2):

  print(num1 + num2)

addNum(2, 4)

​

# Output: 6

==================================================================

​

def multiplyNum(num1):

    return num1 * 8

​

result = multiplyNum(8)

print(result)

​

# Output: 64

==================================================================

def example():          #This defines it

  print("Example.")     #This is the defined commands

​

example()               #And this is the commands being run

OK, basically def function() is a block where you will have one task that you can repeat all over again in the code to make it look short and clean

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 functionName(variable):

  //function content

a = 34

b = 78

def total():

  print("The total of a+b is:",a+b)

  #how to print def function

  total()

#to create a function in python, do the following

​

#create func

def func(): #can add variables inside the brackets

  print("This is the function of the func")

# to call a function, do the following

func()

​

#you would get a line of code saying "This is the function of the func"

​

# By Codexel

def main():

#this will define your function, which you can use in the program

#or you can use it in other programs too, which ill show later

#also you have to call your function once atleast

    userinput = input("String: ")

    #ask the user for input, which is being stored in userinput

    if len(userinput) < 5:

        print("it is longer")

    else: 

        print("it is shorter")

main()

#this will call the function

'''

to use your function in other programs, you can just do the following

from (the name of the program you want to import the function from) import (function name)

done!

​

Really hoped this helped

'''

print("Hello below this is function")

def hi():

    print("Hi I am a function")

hi()                                    # You must call the function