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## Functions:

In this module we will be going through the below given content:

Learn Python in 16 hrs from experts

## Python Functions:

Function is a block of code which provides the re-usability of code. There are two types of functions –
Built – in function (Already created i.e. predefined)
User defined function (Created by users according to the requirements)

### Defining a Function

A function contains following format –

def (arg1, arg2,… argN):
return

• def keyword is used to start the Function Definition
• def is followed by function-name which is followed by parenthesis which contains the arguments passed by the user and use the colon at the end
• Statement specify the body of function.
• Return sends a result object back to the caller

(parameters)

e.g.

def sum(x, y):
z = x + y
return z
sum(5,10)Output
15

## Scope of variable

Scope of a variable means the portion of the program where you can access a particular identifier. There are two types of scope of variable –

• Local Variable
• Global Variable

### Local variables

The variables which can only be accessed in that function where it is declared. Outside the function body, it cannot be accessed.

def sum(x, y):
z=x + y
print(z) # print 8
return
sum(2,6)
print(z) # shows errorOutput
8
—————————————————————————
NameError Traceback (most recent call last)
in
4 return
5 sum(2,6)
—-> 6 print(z) # shows errorNameError: name ‘z’ is not defined

### Global variables

Variable which is declared outside the function is known as global variable. It can be accessed anywhere throughout the program.

x=20
def sum(y):
z=x + y
print(z) # print 30
return z
sum(10)
print (x) # print 20output:
30
20
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## Anonymous Function:

Functions which have no name is known as anonymous function which is created by using lambda. is created without using the def keyword.

Syntax:

lambda arg1,arg2,arg3,…,arg n :expression

e.g.

sum=lambda i1:i1+i1
print “Sum is”,sum(20)
Output
Sum is 40

Now that we are familiar with the functions of python.

We can go ahead a bit deeper and discuss how to deal with the files and perform different operations on them from our Python tutorial.

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