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51. Using finally and else

1. Introduction​

Python's try statement can include optional else and finally blocks:

  • else runs if no exception occurs.
  • finally always runs, regardless of whether an exception occurs.

2. Using else​

try:
    x = 10 / 2
except ZeroDivisionError:
    print("Division by zero")
else:
    print("No error, result =", x)

3. Using finally​

try:
    f = open("example.txt", "w")
    f.write("Hello")
finally:
    f.close()
    print("File closed")

4. Combining else and finally​

try:
    x = int("42")
except ValueError:
    print("Invalid number")
else:
    print("Conversion succeeded:", x)
finally:
    print("Done processing")

5. Why Use else?​

Keeps success-path logic separate from error handling.

6. Why Use finally?​

Guarantees cleanup (e.g., closing files, releasing resources).

7. Next Steps​

✅ You now understand how to use else and finally in exception handling.
Next: Common built-in exceptions.