Function definition(Sub program) - Python

Function definition: (Sub program)

v   def keyword is used to define a function.

v   Give the function name after def keyword followed by parentheses in which arguments are given.

v   End with colon (:)

v   Inside the function add the program statements to be executed

v   End with or without return statement

Syntax:

def fun_name(Parameter1,Parameter2…Parameter n):

statement1

statement2…

statement n

return[expression]

Example:

def my_add(a,b):

c=a+b

return c

Function Calling: (Main Function)

Ø   Once we have defined a function, we can call it from another function, program or even the Python prompt.

Ø   To call a function we simply type the function name with appropriate

arguments.

Example:

x=5

y=4

my_add(x,y)