Defining Functions - Python

A function is a block of organized, reusable code that is used to perform a single, related action. Functions help in organizing code. Functions provide better modularity for your application and a high degree of code reusing.

As you already know, Python gives you many built-in functions like print(), etc., but you can also create your own functions. These functions are called user-defined functions.

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Python provides some basic user defined functions that are built-in. Programmers can also build their own functions. There are many built in functions in Python and it is not possible to describe all over here. However, the following table explains some of the commonly used built in functions.

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For defining your own functions, you will have to remember the following:

1. A function is defined with the help of the keyword def

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2. The function name must end with parentheses ‘()’ followed by colon ‘:’ The syntax for defining a function is as follows:

def function_name(args):

code_to_execute

Functions are completely independent of the main program. You may consider it as a mini independent program that may require some parameters for execution. The main program will only about the value returned by the function, and it is not concerned about what is actually done.

-Once a function has been designed it can be called from anywhere in the program

Format:

function_name(args)

EXAMPLE

def whoAmI(str):
print ‘I am’,str
a=’Apple’
b=7
c =’Cat’
whoAmI(a)
whoAmI(b)
whoAmI(c)

Output: I am Apple; I am 7; I am Cat

-Making a function returns a value

Format:

def function_name():

code_to execute

return value

EXAMPLE

def whoAmI(str):
return str
a=’Apple’
b=’ball’
c =’Cat’
print whoAmI(a)
print whoAmI(b)
print whoAmI(c)

output: I am Apple; I am ball; I am Cat

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