Exception Handling In Python

What is Exception Handling?

Exception handling in Python allows you to deal with errors that occur during the execution of a program. It helps you manage unexpected situations and prevent the program from crashing. In Python, exceptions are raised when an error occurs, and they can be caught and handled using try-except blocks.

Exception handling in Python is used to manage and handle errors that occur during the execution of a program. It's employed in various scenarios, such as valueerror, file not found error, disk full error, permission denied error etc.

Exception Handling Blocks with example:

# Example: Division by zero error handling

try:

    x = 10 / 0  # This will raise a ZeroDivisionError

except ZeroDivisionError:

    print("Error: Division by zero occurred.")

Explanation,

In this example:

We have a try block where the code that may raise an exception is placed.

Inside the try block, we have a division operation 10 / 0, which will raise a ZeroDivisionError because we're trying to divide by zero.

If an exception occurs within the try block, Python will look for a matching except block.

In this case, we have an except block specifically for handling ZeroDivisionError.

If a ZeroDivisionError occurs, the code inside the except block will execute, printing an error message.

Another Example,

You can also have multiple except blocks to handle different types of exceptions:

# Example: Handling multiple types of exceptions

try:

    x = int(input("Enter a number: "))

    result = 10 / x

    print("Result:", result)

except ValueError:

    print("Error: Invalid input. Please enter a valid number.")

except ZeroDivisionError:

    print("Error: Division by zero occurred.")

In this example,

We attempt to convert user input to an integer (int(input(...))), which may raise a ValueError if the input is not a valid integer.

We also perform a division operation, which may raise a ZeroDivisionError.

We have separate except blocks to handle each type of exception.

Depending on the type of exception raised, the corresponding except block will execute, printing an appropriate error message.

Exception handling in Python is essential for writing robust and fault-tolerant code, as it allows you to anticipate and handle errors gracefully.