Python Language Tutorial: Exception Handling - Part Five

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:

• Installation of Python
• Python Programming tutorial Part-1
• Python Programming Tutorial - Part 2
• Python Language Tutorial Part- 3 (Data Structure in List)
• Python Language Tutorial Part- 5 (Module and Input Output)

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 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 above example Shows 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 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 finally statement in each exception for running always code in the finally statement. I hope you will understand this part of python programming language.