Interview question

How does try/except/else/finally work in Python? Python में try/except/else/finally कैसे काम करता है?

Answer

Block	Runs when
try	Contains code that might raise an exception
except	Only if an exception occurs in try
else	Only if NO exception occurred in try
finally	Always, regardless of exception or not (cleanup)

def divide(a, b):
    try:
        result = a / b
    except ZeroDivisionError:
        print('Cannot divide by zero')
        return None
    else:
        print('Division succeeded')  # only runs if no exception
        return result
    finally:
        print('Cleanup runs always')  # always runs

divide(10, 2)
# Division succeeded
# Cleanup runs always

divide(10, 0)
# Cannot divide by zero
# Cleanup runs always

# finally runs even if the function returns from inside try/except
def test():
    try:
        return 'from try'
    finally:
        print('finally still runs before returning')
test()  # prints the finally message, then returns 'from try'

Block	कब चलता है
try	Exception आ सकता है ऐसा code
except	सिर्फ exception आने पर
else	सिर्फ कोई exception न आए तो
finally	हमेशा (cleanup)

def divide(a, b):
    try:
        result = a / b
    except ZeroDivisionError:
        print('Zero से divide नहीं हो सकता')
        return None
    else:
        print('Division सफल')
        return result
    finally:
        print('Cleanup हमेशा चलता है')

divide(10, 2)
divide(10, 0)

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