Exception Handling in Python

Python Programming

Exception Handling in Python

Beginner Lesson 9 of 10

Exception Handling

Learn to handle errors and exceptions gracefully in your Python programs.

Try-Except Blocks

try:
    result = 10 / 0
except ZeroDivisionError:
    print("Cannot divide by zero!")
except Exception as e:
    print(f"Error: {e}")
else:
    print("Success!")
finally:
    print("This always runs")

Raising Exceptions

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

# Custom exceptions
class InvalidEmailError(Exception):
    pass

Common Exceptions

• ValueError - Invalid value
• TypeError - Wrong type
• KeyError - Dict key not found
• IndexError - Index out of range
• FileNotFoundError - File doesn’t exist
• ZeroDivisionError - Division by zero

Next Steps

Continue to Advanced Python →