Types of Exceptions

• In python there are 2 types of exceptions are possible:
  • Predefined Exceptions
  • User Defined Exceptions

Predefined Exceptions

• It is also known as in-built exceptions.
• The exceptions which are raised automatically by python virtual machine whenever a particular event occurs, are called predefined exceptions.

Example

Whenever we are trying to perform division by zero, automatically python will raise, ZeroDivisionError.

print(10/0)

Output

ZeroDivisionError: division by zero

Example

Whenever we are trying to convert input value to int type and if input value is not int value then python will raise ValueError.

x=int("ten")

Output

ValueError: invalid literal for int() with base 10: 'ten'

User Defined Exceptions

• It is also known as customized exceptions or programmatic exceptions.
• Some time we have to define and raise exceptions explicitly to indicate that something goes wrong, such type of exceptions are called user defined exceptions.
• Programmer is responsible to define these exceptions and python not having any idea about these. Hence we have to raise explicitly based on our requirement by using raise keyword.
• Some of the user defined exceptions are:
  • InSufficientFundsException
  • TooOldException

Define and Raise Customized Exceptions

• Every exception in python is a class that extends exception class either directly or indirectly.

Syntax

class classname(Exception):
  def __init__(self, arg):
    self.msg = arg

Example

class TooYoungException(Exception):
  def __init__(self,arg):
    self.msg=arg
class TooOldException(Exception):
  def __init__(self,arg):
    self.msg=arg
age=int(input("Enter Age:"))
if age>60:
  raise TooOldException("Your age already crossed marriage age...no chance of getting marriage")
elif age<18:
  raise TooYoungException("Plz wait some more time you will get best match soon!!!")
else:
  print("You will get match details soon by email!!!")

Output

Enter Age:40
You will get match details soon by email!!!

Enter Age:12
TooYoungException: Plz wait some more time you will get best match soon!!!

Enter Age:67
TooOldException: Your age already crossed marriage age...no chance of getting marriage

Ungraded Questions

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