Please note that until <==> while not. do: <code> until count > 10
do: <code> while count <= 10 Cheers, Hans. -----Original Message----- From: Michael Foord [mailto:[EMAIL PROTECTED] On Behalf Of Fuzzyman Sent: martes, 03 de octubre de 2006 16:29 To: Nick Coghlan Cc: Hans Polak; python-dev@python.org Subject: Re: [Python-Dev] PEP 315 - do while Nick Coghlan wrote: > [snip..] > >> The current idiom works fine, but looks unnatural : >> >> while True: >> if <condition>: >> break > > > There's the rationale for the PEP in a whole 5 lines counting > whitespace ;) > >> Would a 'while' outside of a 'do' block (but without the colon) then be >> a syntax error ? >> >> 'do:' would just be syntactic sugar for 'while True:' I guess. > > > That's the slight issue I still have with the idea - you could end up > with multiple ways of spelling some of the basic loop forms, such as > these 3 flavours of infinite loop: > > do: > pass # Is there an implicit 'while True' at the end of the loop > body? > > do: > while True > > while True: > pass > Following the current idiom, isn't it more natural to repeat the loop 'until' a condition is met. If we introduced two new keywords, it would avoid ambiguity in the use of 'while'. do: <loop body> until <condition> A do loop could require an 'until', meaning 'do' is not *just* a replacement for an infinite loop. (Assuming the parser can be coerced into co-operation.) It is obviously still a new construct in terms of Python syntax (not requiring a colon after '<condition>'.) I'm sure this has been suggested, but wonder if it has already been ruled out. An 'else' block could then retain its current meaning (execute if the loop is not terminated early by an explicit break.) Michael Foord http://www.voidspace.org.uk This message contains information that may be privileged or confidential and is the property of the Capgemini Group. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com