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Python Exception Handling (try-except)

In Python, exceptions are handled using try, except, else, and finally blocks. This helps catch errors during program execution and prevents abnormal termination.

Basic Exception Handling (try-except)

try:
    # Code that may raise an error
    result = 10 / 0
except ZeroDivisionError:
    # Code to run if ZeroDivisionError occurs
    print("Cannot divide by zero!")
  

Advanced Exception Handling (try-except-else-finally)

try:
    # Code that may raise an error
    num1 = int(input("Enter the first number: "))
    num2 = int(input("Enter the second number: "))
    result = num1 / num2
except ZeroDivisionError:
    print("Cannot divide by zero.")
except ValueError:
    print("Please enter a valid number.")
else:
    # Runs if no exception occurs
    print(f"Calculation result: {result}")
finally:
    # Always runs, regardless of exception
    print("Calculation completed.")
  

Key Points

• Multiple exceptions: Use multiple except blocks to handle different types of errors.
• Exception info: Use except Exception as e: to access error messages or exception details.
• Prevent program crash: Try-except blocks ensure that even if an error occurs, the program continues safely.

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Use exception handling in Python to manage runtime errors, maintain program stability, and provide meaningful error messages to users.