Python Projects & Resources

✅ Python Exception Handling! 🐍✨ Exception handling allows your program to handle errors gracefully instead of crashing unexpectedly.

num = 10
print(num / 0)

❌ Output → ZeroDivisionError 💡 Without exception handling, the program stops immediately when an error occurs. 1. Basic Syntax: › Use try and except to handle errors.

try:
    num = 10 / 0
except ZeroDivisionError:
    print("Cannot divide by zero")

✔ Output → Cannot divide by zero 2. Catch Any Exception: Use Exception to handle all types of errors.

try:
    number = int("Hello")
except Exception:
    print("Something went wrong")

✔ Output → Something went wrong 3. Catch Multiple Exceptions:

try:
    num = int(input("Enter a number: "))
    print(10 / num)

except ValueError:
    print("Invalid number")

except ZeroDivisionError:
    print("Cannot divide by zero")

💡 Different errors can be handled separately. 4. Using else: The else block runs only if no exception occurs.

try:
    num = 10 / 2

except ZeroDivisionError:
    print("Error")

else:
    print("Division Successful")

✔ Output → Division Successful 5. Using finally: The finally block always executes, whether an exception occurs or not.

try:
    print(10 / 2)

except ZeroDivisionError:
    print("Error")

finally:
    print("Program Finished")

✔ Output → 5.0 Program Finished 💡 Commonly used to close files or database connections. 6. Using raise: Manually raise an exception.

age = -5

if age < 0:
    raise ValueError("Age cannot be negative")

✔ Output → ValueError: Age cannot be negative 7. Get the Error Message:

try:
    print(10 / 0)

except Exception as e:
    print(e)

✔ Output → division by zero 💡 e stores the actual error message. 8. Nested Exception Handling:

try:
    try:
        print(10 / 0)
    except ZeroDivisionError:
        print("Inner Exception")
except:
    print("Outer Exception")

✔ Output → Inner Exception 9. Common Python Exceptions: ✔ ZeroDivisionError → Dividing by zero: 10 / 0 ✔ ValueError → Invalid value: int("Hello") ✔ TypeError → Invalid data type: 10 + "20" ✔ IndexError → Invalid list index:

nums = [1, 2]
print(nums[5])

✔ KeyError → Missing dictionary key:

student = {"name": "Alex"}
print(student["age"])

✔ FileNotFoundError → File doesn't exist: open("data.txt") 10. Practice Examples: ✔ Handle invalid input

try:
    age = int(input("Enter age: "))
    print(age)

except ValueError:
    print("Please enter a valid number")

✔ Handle list index error

try:
    nums = [10, 20]
    print(nums[5])

except IndexError:
    print("Index out of range")

✔ Handle dictionary key error

try:
    student = {"name": "Alex"}
    print(student["age"])

except KeyError:
    print("Key not found")

💡 Exception handling makes your programs more reliable by preventing unexpected crashes and providing meaningful error messages. 💬 Tap ❤️ if this helped you!