Exception Handling in python

Welcome to the world of Python exception handling, folks! Are you ready to take your coding game to the next level? Great, because exception handling is the ultimate power tool for any Python programmer. With exception handling, you can handle errors and unexpected situations in your code, without causing the program to crash. And the best part? It’s not as scary as it seems.

What are exceptions

Exceptions occur during the execution of a program that disrupts the normal flow of instructions. They are usually caused by errors in the code, such as a division by zero or trying to access an index that does not exist in a list.

Try-Except Statements

Use try-except statements to handle exceptions. The try block contains the code that may cause an exception, and the except block contains the code that will execute if an exception occurs.

try:
    result = 5 / 0
except ZeroDivisionError:
    print("You can't divide by zero, silly!")

In this example, the code tries to divide 5 by 0 which will raise an exception of ZeroDivisionError, the except block will catch that exception and print the message “You can’t divide by zero, silly!”

Handling multiple exceptions

You can use except block to handle multiple exceptions, for example:

try:
    number = int(input("Enter a number:"))
    result = 5 / number
except ZeroDivisionError:
    print("You can't divide by zero, silly!")
except ValueError:
    print("You should have entered a number")

The finally block

Use a finally block to add code that will always execute, whether an exception occurs or not.

try:
    result = 5 / 0
except ZeroDivisionError:
    print("You can't divide by zero, silly!")
finally:
    print("The program has finished")

Raising exceptions

You can raise exceptions in your own code, for example:

def square(number):
    if number < 0:
        raise ValueError("The number should be positive")
    else:
        return number**2

Prevention is better than cure

Prevent exceptions from happening by validating user input, checking for edge cases, and making sure that your code is robust enough to handle different situations.

Meaningful error messages

Make sure that the exceptions you raise have informative and meaningful error messages. This can make it easier to understand what went wrong and make it easier to fix the problem.

In conclusion, exception handling is an essential tool for dealing with errors and unexpected situations in your code. Try-except statements, the finally block, and raising exceptions are all important tools that can help you handle exceptions in your program. Use them wisely and always remember to keep your code clean and readable. Happy coding!