Alan Kennedy wrote: > [Frank Millman] > > I am writing a multi-user accounting/business application, which uses > > sockets to communicate between server and client. The server contains > > all the business logic. It has no direct knowledge of the client. I > > have devised a simple message format to exchange information between > > the two. > > > > If you're going to mix javascript client and python server, you > definitely need something cross platform, like XML or JSON. > [...] > > I'd go with JSON, for simplicity and portability. If you have any > specific questions about it, ask. >
Thanks for the offer. I have just tried it out, and instantly bumped my head. I think I know the problem, and I don't think there is a simple answer, but I will ask here first before starting to figure out a way around it. My client-server is Python-to-Python. At present, I am using cPickle to transfer objects between the two. Among other things, I sometimes transfer a tuple. Using JSON it appears on the other side as a list. As I sometimes use the tuple as a dictionary key, this fails, as you obviously cannot use a list as a key. I am using 'simplejson'. I see there is also something called json-py, but I have not tried it yet, as I am assuming (maybe wrongly) that it will have the same problem. My hunch is that javascript/JSON does not have the concept of a tuple, and therefore the problem is inherent. Can someone confirm this, or is there an easy workaround? Thanks Frank -- http://mail.python.org/mailman/listinfo/python-list