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:
1)
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")
2)
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")
3)
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")
4)
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")