Functions in Python

Similar to other programming languages python also has:

• user defined functions
• built-in functions

Built-in functions are pre-defined in Python. For example id() which returns the id of the object and print() which prints the output are built-in functions.

user defined functions are the ones defined by python programmer. For example, if the programmer wants to perform sum of two variables, the program shall be as below

def sum(c,d):

    e = c+d

    print(e)

a = 10

b = 10

sum(a,b)

-------------------------------------------

The above program doesn't return any value. Let us assume a function has to return a value, then the return value from function shall be printed as below.

def sum(c,d):

    e = c+d

    return e

a = 10

b = 10

print(sum(a,b))