how to define functions in 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!

1#A function is a block of code which only runs when it is called.
2#You can pass data, known as parameters, into a function.
3#folling is a simple function
4def exmple_of_function():
5  print("Hello from a function")
6
7example_of_function()

1
2  def my_function():
3  print("Hello from a function")
4
5
6  my_function() 

1# Python Functions
2def a_function(): #def FUNCTIONNAMEHERE(): Function content
3  print("Hello World!")
4  return 0
5def answerValid(prompt, correct_answers, invalid): # Functions can also have parameters, or variables that can be used only in tha function
6  while True:
7    user = input(prompt)
8    if user in correct_answers:
9      break 
10      return user # Example Function
11   	else:
12      print(invalid)
13
14a_function() # To call a function; Prints 'Hello World!'
15# But if this is done:
16function_called = a_function() # function_called would contain a 0, because the function returns 0
17answer = answerValid("What is 8 * 8?", [64], "Invalid Option")
18print(answer) # Prints 64, because that is the only possible answer

1def add(number):
2  equation = 5 + number
3  print(equation)
4  
5 
6add(10)
7
8output:
9  
10  15
11  

1def functionName(variable):
2  //function content