Lecture8 # Error Handling with Try-Except

Error handling with try and except is a crucial aspect of Python programming that allows you to handle exceptions and prevent your program from crashing when it encounters unexpected errors. It's a way to gracefully manage and recover from exceptional conditions.

My Python codes: https://masterwithhamza@bitbucket.org/hamxaflutterapps/mypythoncodes.git

In Python, you use a try block to enclose code that might raise an exception. You then follow it with one or more except blocks that specify how to handle different types of exceptions. If an exception occurs within the try block, Python checks if there's a corresponding except block for that exception. If one is found, the code inside the except block is executed.

Here's the basic structure:

try:
    # Code that might raise an exception
except ExceptionType:
    # Code to handle the exception

try: Encloses the code where an exception might occur.
except ExceptionType: Specifies the type of exception to handle. You can catch specific exceptions or a more general Exception class.

try:
    number = int(input("Enter a number: "))
    result = 10 / number
    print("Result is:", result)
except ZeroDivisionError:
    print("Error: Cannot divide by zero.")
except ValueError:
    print("Error: Invalid input. Please enter a valid number.")

In this example, the try block attempts to get user input, perform a division operation, and print the result. If the user enters zero, it raises a ZeroDivisionError. If the user enters something that's not a number, it raises a ValueError. The corresponding except blocks handle each of these exceptions gracefully.

Conclusion

Error handling with try and except is an essential aspect of writing robust Python programs. It allows you to anticipate and manage exceptions, making your code more reliable and user-friendly. As you gain more experience in Python, you'll develop a better understanding of when and how to use error handling effectively in your programs.