Interview question

What is the difference between raise, raise Exception, and re-raising a caught exception with bare raise? raise, raise Exception, और caught exception को bare raise से re-raise करने में क्या अंतर है?

Answer

Usage	Effect
raise SomeError('msg')	Raises a new exception with a fresh traceback starting here
raise (bare, inside except)	Re-raises the CURRENTLY caught exception, preserving its original traceback
raise from	Raises a new exception while explicitly linking to the original cause

def process(value):
    try:
        return 100 / value
    except ZeroDivisionError:
        print('Logging the error before re-raising')
        raise  # bare raise - re-raises the SAME ZeroDivisionError with original traceback

try:
    process(0)
except ZeroDivisionError:
    print('Caught it again at a higher level')

# Common pattern: log/handle partially, then let the caller decide what to do
def risky_operation():
    try:
        do_something_risky()
    except ValueError as e:
        log_error(e)
        raise  # don't swallow the error, let it propagate after logging

# Contrast: creating a NEW exception loses the original traceback context
# unless you use 'raise NewError(...) from e'
def process_wrapped(value):
    try:
        return 100 / value
    except ZeroDivisionError as e:
        raise RuntimeError('Processing failed') from e  # new exception, cause preserved

Usage	Effect
raise SomeError('msg')	नया exception, नया traceback
raise (bare, except के अंदर)	Currently caught exception को उसी traceback के साथ re-raise करता है
raise from	नया exception, original cause से link करते हुए

def process(value):
    try:
        return 100 / value
    except ZeroDivisionError:
        print('Re-raise से पहले log करना')
        raise  # bare raise - same exception, original traceback

try:
    process(0)
except ZeroDivisionError:
    print('ऊपर फिर से caught हुआ')

def risky_operation():
    try:
        do_something_risky()
    except ValueError as e:
        log_error(e)
        raise  # error को swallow मत करो

def process_wrapped(value):
    try:
        return 100 / value
    except ZeroDivisionError as e:
        raise RuntimeError('Processing fail हुआ') from e

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