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Error Handling in Python
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Course Content

Error Handling in Python

Error Handling in Python

1. Handling Structure
Concept of ErrorsDetect and CatchChallenge: Catch an ErrorSpecified ExceptionException AliasAdditional ElementsChallenge: Full Exception Handling
2. Exception Usage
Difference between Exceptions and ErrorsException Hierarchy

bookAdditional Elements

The full handle structure has 2 additional elements: else and finally.

Look at the example:


              
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def divide_numbers(a, b):
    try:
        result = a / b
    except ZeroDivisionError as error:
        print("(except) ZeroDivisionError: Cannot divide by zero.")
    except TypeError as error:
        print("(except) TypeError: Invalid data type for division.")
    else:
        print("(else) Division result:", result)
    finally:
        print("(finally) Finally block executed.")

# Example usage:
print("=== CASE 1 ===")
divide_numbers(10, 2)       # This will execute the else block and finally block.
print("=== CASE 2 ===")
divide_numbers(5, 0)        # This will raise a ZeroDivisionError, execute the except block, and the finally block.
print("=== CASE 3 ===")
divide_numbers(10, "two")   # This will raise a TypeError, execute the except block, and the finally block.
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As you can see, the code handles different exceptions appropriately and ensures:

  • the else block is executed when errors are not raised;
  • the finally block is executed in all cases.

Handle Structure Diagram

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Section 1. Chapter 6
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