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Python Function


A function is a self-contained block of statements that perform a specific task. A function can be call many times.By using function we can divide a code into the function.Function provides modularity and code reusability.


Types Of Functions


There are two types of functions-

» Library Functions or Built-in Functions
» User-defined functions


Library Functions

They Are Pre Defined header files.Python used many predefined functions.

User-defined functions

These functions are declared by the user depends on their requirements.It reduces complexity of a big program.


def (function_name)(parameters):   

Keyword def is used to start and declare a function.


def add(a,b):   
    s=a+b  
    print "Sum of two numbers is :"  
       print s  
    add(20,30) #Calling the sum Function     

output:
Sum of two numbers is :50






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