Exception Handling

Errors:

A programming mistake is said to be an error.

There are three types of errors:

1) Compile time errors

2) Run time errors

3) Logical errors

Compile time errors are also called syntax errors.

Run time errors are also called exceptions.

Example of syntax error:

i=0

if i==0

print(i)

In the above example we have missed the : symbol after if statement. It is called as syntax error.

Example of exception:

a=10

b=0

print(a//b)

In the above example ZeroDivisionError occurs. It is called as an exception.

This type of exceptions can be handled explicitly to display user friendly error messages.

Handling Exceptions:

Syntaxes:

1) try with except block:

try:

========

except ExceptionClassName:

========

2) try with multiple except blocks:

try:

==========

except ExceptionClassName1:

===========

except ExceptionClassName2:

===========

3) Multiple exceptions in a single block:

try:

==========

except(ExceptionClassName1, ExceptionClassName2, ........)

==========

4) except block without exception class name

try:

==========

except:

==========

Examples:

try:

a=int(input("Enter First Number: "))

b=int(input("Enter Second Number: "))

c=a//b

print(c)

except ZeroDivisionError:

print("Enter Second Number Except Zero")

try:

a=int(input("Enter First Number: "))

b=int(input("Enter Second Number: "))

c=a//b

print(c)

except ValueError:

print("Enter Numbers Only")

except ZeroDivisionError:

print("Enter Second Number Except Zero")

try:

a=int(input("Enter First Number: "))

b=int(input("Enter Second Number: "))

c=a//b

print(c)

except(ZeroDivisionError, ValueError):

print("Enter two numbers and second number except zero")

try:

a=int(input("Enter First Number: "))

b=int(input("Enter Second Number: "))

c=a//b

print(c)

except:

print("Enter two numbers and second number except zero")

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Core Python Advanced Python By Venkatesh Mansani venkatesh.mansani@yahoo.com

Python By Venkatesh Mansani