Functions in Python

 

Python Functions

Syntax :

                keyword def    function_name () :

Function is a collection of statement(s), to perform certain operation(s).

Re-usability of code is the main advantage of function.

As informed earlier, there is no { } concept, instead we : (colon) and then followed by indentation.

Function can be defined in 4 ways : 

• Without parameter, Without return

 #program to a function defined as without parameter and without return
 def add() :
     a = 5
     b = 10
     c = a+b
     print(c)

 add()

 #output
 15

• Without parameter, With return

 #program to a function defined as without parameter and with return
 def add() :
     a = 5
     b = 10
     return a+b

 c = add()
 print(c)

 #output
 15

• With parameter, Without return

 #program to a function defined as with parameter and without return
 def add(a,b) :
     c = a+b
     print(c)

 a = 5
 b = 10
 add(a,b)

 #output
 15

• With parameter, With return

 #program to a function defined as with parameter and with return
 def add(a,b) :
    return a+b

 a = 5
 b = 10
 c = add(a,b)
 print(c)
 #output
 15