On Sat, 12 Nov 2005 10:20:08 +0100, Sybren Stuvel <[EMAIL PROTECTED]> wrote:
>Shi Mu enlightened us with: >> very hard for me to understand the difference between try...except >> and try...finally > >Within a 'try' block, if an exception is called and a matching >'except' block is found, that block will be used to handle the >expression. > >From the documentation of the "return" keyword: "When return passes >control out of a try statement with a finally clause, that finally >clause is executed before really leaving the function." Note that >there is no talk about exceptions in this. > Which is because in the finally block the exception is still "live" and will take effect as soon as the finally block is left, e.g., >>> try: ... try: 1/0 ... finally: print 'exception can not bypass finally' ... except Exception, e: ... print '%s: %s' %(e.__class__.__name__, e) ... exception can not bypass finally ZeroDivisionError: integer division or modulo by zero Or to make the point about return >>> def foo(den): ... try: ... try: return 1/den ... finally: print 'exception can not bypass finally' ... except Exception, e: ... print '%s: %s' %(e.__class__.__name__, e) ... return 'succeeded in returning something' ... >>> foo(0) exception can not bypass finally ZeroDivisionError: integer division or modulo by zero 'succeeded in returning something' >>> foo(1) exception can not bypass finally 1 Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list
