def function python

1def myFunction(say): #you can add variables to the function
2  print(say)
3
4myFunction("Hello")
5
6age = input("How old are you?")
7
8myFunction("You are {} years old!".format(age))
9
10#this is what you get:
11
12Hello
13How old are you?
14>>11 #lol my real age actually
15You are 11 years old!

1def example():			#This defines it
2  print("Example.")		#This is the defined commands
3
4example()				#And this is the commands being run

1def test_function(argument1,argument2,argument3) :
2  # Do something with the code, and the arguments.
3  print(argument1)
4  print(argument2)
5  print(argument3)
6  
7# Calling the function.
8
9test_function('Hello','World','!')
10
11# Output
12'''
13Hello
14World
15!
16'''

1#    Parameter of the function
2#              |
3def greetings(Name):
4  #Content inside the function
5  print("Hello",Name)
6  print("How are you",Name)
7print(greetings("Python devloper"))
8#                     ^
9#                     |
10#             Argument of the function

1OK, 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

1def hello(first_name,last_name,age):
2    print("hello",first_name ,last_name)
3    print("ur r",age,"years old")
4    print("nice to meet u")
5
6
7hello("Bro","Code","21")