#8 Python Tutorial for Beginners

Hello Guys,

   In previous tutorial you learned about while loop , list value with while loop , for loop , range function , break statement and continue statement.

   In this tutorial you will learn below points:

• Function 
• Types of function
• Function With Argument
• Default Parameter Value
• Recursion

Let's get started.

Function

• function is group of statement performing specific task.
• function can be reused by the programmer any number of time.

Syntax :

               def  function_name( ):

                           "block of statement"

• def "keyword" is used to create function.

Example :

def function(): return "Hello World" print(function())

Types Of Function

   

   Built In Function

• Built in function means already present in python.
• Example of Built in function includes len( ) , print( ) , range ( ).

   User-Defined Function

• User Defined function means function create by programmer.

Function With Argument

• value can be passed into function as argument.
• Argument are specified in function parentheses. We can add many argument and separated by comma.

Syntax :

        def  function_name( argument_name ):

                           "block of statement"

Example :

def function_argument(name): print("Hello " + name + " How are you ?") function_argument("Ps_Inf0")

Default Parameter Value

• we can have a value as default parameter in a  function.
• If user call the function without parameter value then it uses the default parameter value.

Syntax :

        def  function_name( argument_name = "argument_value"):

                           "block of statement"

         function_name("argument_value")

         function_name( )

Example :

def argu_default(name="inf0psh"): print ("Hello "+ name) argu_default() argu_default("Ps_Inf0")

Recursion

• Recursion is a function which  call itself.
• Recursion is a common mathematical and programming concept.

Example :

def factorial(n): if(n == 0 or n == 1): return 1 else: return n * factorial(n-1) print(factorial(30)) print(factorial(9))

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