Python Language Tutorial: Exception Handling

Introduction

Today I will take a new part of python for my tutorial series. In this part, you will learn Exception Handling.

I already told you the following:

Python language has various types of Exception Handling. I will tell you some exception handling in Python and their examples.

Example of Exceptions:

Num1=5
Num2=0;
print(Num1/Num2)

Output: ZeroDivisionError: division by zero,

print(“10”+6)

Output: TypeError: Can't convert 'int' object to str implicitly.

print(2+4*num)

Output: NameError: name 'num' is not defined.

import math
math.exp(10000)

Output: OverflowError: math range error,

from foo import too

Output : ImportError: No module named 'foo'.

array={'a':'1','b':'2'}
array['c']

Output : KeyError: 'c'

array = [1,2,3,4,5,6,7]
array[10]

Output : IndexError: list index out of range.

So above all examples shows the exceptions in python programs with different-2 types.

So now I will tell you how to handle Exceptions

Example of Exception Handling:

try:

num1=5
num2=0
print(num1/num2)
except ZeroDivisionError:
print("Divided By Zero")

Output : Divided by Zero

try:

print("10"+6)
except TypeError:
print("Error occured in \"10\"+6")

Output : Error occured in "10"+6

try:

print(2+4*num)
except NameError:
print("num is not define")

Output : num is not define

So many exception handlings can handle the above Examples.

Raising Exceptions:

The raise statement forces an indication of specified Exception to occur.

try:

num1=5
num2=0
print(num1/num2)
except ZeroDivisionError:
raise ZeroDivisionError("Error Occured")

Output : Shown in below image

So the above example, Shows a raise statement and prints the error forcibly in except module.

Finally :

In any exception occurred in code finally statement always runs after the execution of the code in the try block

try:

num1=5
num2=0
print(num1/num2)
except ZeroDivisionError:
print("Error Occured")
finally:
print("This code will run always")

Output: Error Occured

This code will run always.

So we can use the final statement in each exception for running always code in the final statement. I hope you will understand this part of the python programming language.