Python try finally block returns [duplicate]

From the Python documentation

A finally clause is always executed before leaving the try statement, whether an exception has occurred or not. When an exception has occurred in the try clause and has not been handled by an except clause (or it has occurred in a except or else clause), it is re-raised after the finally clause has been executed. The finally clause is also executed “on the way out” when any other clause of the try statement is left via a break, continue or return statement. A more complicated example (having except and finally clauses in the same try statement works as of Python 2.5):

So once the try/except block is left using return, which would set the return value to given - finally blocks will always execute, and should be used to free resources etc. while using there another return - overwrites the original one.

In your particular case, func1() return 2 and func2() return 3, as these are values returned in the finally blocks.

It will always go to the finally block, so it will ignore the return in the try and except. If you would have a return above the try and except, it would return that value.

def func1():    try:        return 1 # ignoring the return    finally:        return 2 # returns this returndef func2():    try:        raise ValueError()    except:        # is going to this exception block, but ignores the return because it needs to go to the finally        return 1    finally:        return 3def func3():    return 0 # finds a return here, before the try except and finally block, so it will use this return     try:        raise ValueError()    except:        return 1    finally:        return 3func1() # returns 2func2() # returns 3func3() # returns 0

Putting print statements beforehand really, really helps:

def func1():    try:        print 'try statement in func1. after this return 1'        return 1    finally:        print 'after the try statement in func1, return 2'        return 2def func2():    try:        print 'raise a value error'        raise ValueError()    except:        print 'an error has been raised! return 1!'        return 1    finally:        print 'okay after all that let\'s return 3'        return 3print func1()print func2()

This returns:

try statement in func1. after this return 1after the try statement in func1, return 22raise a value erroran error has been raised! return 1!okay after all that let's return 33

You'll notice that python always returns the last thing to be returned, regardless that the code "reached" return 1 in both functions.

A finally block is always run, so the last thing to be returned in the function is whatever is returned in the finally block. In func1, that's 2. In func2, that's 3.