Reactive programming in Python ?
in [Python]
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From: Stefan Behnel on 17 Apr 2010 02:09 pca, 16.04.2010 22:02: > On Apr 16, 8:28 pm, Stefan Behnel wrote: >> pca, 16.04.2010 17:18: >> >>> In fact, I have seeded an open-source project, Yoopf, that enables >>> programming by formula within Python, with the goal of dramatically >>> accelerating the development of the model view in the MVC model. >> >> Looks like the example on the main page would work better with the "any" >> builtin than with the "sum" builtin. > > I'm not sure what you mean. The example formula in the main page of > http://www.yoopf.org calculates the total amount of an order as the > sum of the amount of each order line: why the 'any' ? I guess I misinterpreted the phrase "only when one of its order line has been added or deleted" as meaning that a change to any of the amounts would trigger an event. It wasn't clear to me that the example actually presented a calculation that would be evaluated based on that event. You might want to give potential users a better idea of what this tool does. Neither your announcement nor the homepage made that clear to me. Stefan
From: pca on 17 Apr 2010 04:13
On Apr 17, 8:09 am, Stefan Behnel <stefan...(a)behnel.de> wrote: > pca, 16.04.2010 22:02: > > > On Apr 16, 8:28 pm, Stefan Behnel wrote: > >> pca, 16.04.2010 17:18: > > >>> In fact, I have seeded an open-source project, Yoopf, that enables > >>> programming by formula within Python, with the goal of dramatically > >>> accelerating the development of the model view in the MVC model. > > >> Looks like the example on the main page would work better with the "any" > >> builtin than with the "sum" builtin. > > > I'm not sure what you mean. The example formula in the main page of > >http://www.yoopf.orgcalculates the total amount of an order as the > > sum of the amount of each order line: why the 'any' ? > > I guess I misinterpreted the phrase "only when one of its order line has > been added or deleted" as meaning that a change to any of the amounts would > trigger an event. It wasn't clear to me that the example actually presented > a calculation that would be evaluated based on that event. > > You might want to give potential users a better idea of what this tool > does. Neither your announcement nor the homepage made that clear to me. > > Stefan Thanks for the feedback, Stefan. I have rephrased the sentence as follows. Is that more clear ? "For example, this formula is fed to the library to define the total amount of each Order object as the sum of the amount of its order line: "Order.amount = sum(Order.order_lines.amount) "At the end of a transaction, the formula calculator is run : it will calculate the formula only for the Order objects that need recalculation (e.g because one of its order line has been added or deleted, or the amount of a line has been changed). Thanks. Pierre C. |