Beginner LevelPython
How does the try-except-else-finally exception handling block execute in Python?
❓ Interview Prompt: Explain exception handling control flow: `try`, `except`, `else` (runs ONLY if no exception occurred), and `finally` (ALWAYS runs).
Python's exception handling control flow consists of four clauses:
•
'try': Code block monitored for exceptions.
•
'except ExceptionType': Executes ONLY if a matching exception is raised inside 'try'.
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'else': Executes ONLY if the 'try' block completed WITHOUT raising any exceptions.
•
'finally': Executed ALWAYS, regardless of whether an exception occurred, was caught, or was uncaught! Ideal for closing file handles and database connections.
Code Implementation Example
python
def divide_and_log(a, b):
try:
result = a / b
except ZeroDivisionError as err:
print('Error: Division by zero!')
else:
print(f'Success! Result is {result}') # Runs ONLY if try succeeds!
finally:
print('Cleanup: Execution complete.') # ALWAYS runs!💡Exception control flow showing try, except, else, and finally blocks.
🎯 Interview Key Takeaway
Use the 'else' block for code that should execute only when try succeeds, and 'finally' for guaranteed resource cleanup.
#Exception Handling#try-except#else#finally#Beginner
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