Python - Exceptions

Use of exceptions is to have a robust program and avoid any unintended termination of program execution. 

• Each exception is represented as class in Python
• Python provides built-in exceptions
• users can define their own user-defined exceptions
• BaseException is the base class for all the Python built-in exceptions
• Exception is the sub class of BaseException

The sample program for the exception is

ls = ['a', 'b','45','77']

try:

    print(ls[4])

except Exception as k:

    print(k)

finally:

    print("Hello")

• The statements inside the except block are called handlers
• The statement inside the finally block are executed irrespective of the exception
• finally is needed for proper closure of the except block