> On Aug 6, 2018, at 5:19 AM, c.holterm...@gmx.de wrote: > > Am 2018-08-06 11:35, schrieb Geert Janssens: >> Op maandag 6 augustus 2018 05:32:27 CEST schreef John Ralls: >>> > On Aug 5, 2018, at 5:17 PM, c.holterm...@gmx.de wrote: >>> > >>> > Hello, >>> > >>> > after some time I get back to the gnucash python bindings. >>> > >>> > I worked on a str method for GncNumeric. It's in the example_script >>> > dir >>> > (https://github.com/Gnucash/gnucash/blob/maint/bindings/python/example_sc >>> > ripts/str_methods.py) I changed it to python3. >> I read at the beginning of this file you chose to implement it as an example >> script which - if found useful - could be added to gnucash_core. >> You have my blessing to include it in gnucash_core :) >>> > Well I found it interesting to think these things through. Maybe someone >>> > can tell me about the mysterious "later on" in the cited comment. At this >>> > point I find it useful to have a way from the instance to the wrapping >>> > object through some kind of link as I suggested in the patch to >>> > function_class. >>> Christoph, >>> The person who wrote the first two lines of that, Mark Jenkins, was the >>> original source of the Python bindings. He was never a regular dev, he just >>> got 16 patches committed between 2007 and 2012, 10 of which touched the >>> python bindings. Your history with them is almost as long as his--in fact >>> you have *12* commits--and pretty much no one else has done anything >>> serious with them. >> Hopefully Mark is still around on the list to clarify. >>> In other words, if anyone knows, it’s you! >> True :) >>> Just to add some more confusion, there’s now a C++ class GncNumeric that >>> handles the actual implementation of many of the gnc_numeric.* functions. I >>> believe that SWIG can’t see it, only the C wrapper functions are exposed to >>> SWIG. >> It would be a very useful experiment to wrap the C++ GncNumeric class >> directly >> rather than it's c wrapper gnc_numeric_xxx. Python doesn't need the c >> compatibility layer it represents. >> Geert > > Geert, > > unfortunately your mail went to my spam folder for whatever reason. Trying to > do C++ bindings for python sounds very interesting. I'd like to try that when > I find the time for a simple example type. I don't know if GncNumeric would > be a good candidate. I'll have a look at it. Thanks for the blessing :-)
Python has its own rational numbers so the only thing the Python bindings need is a way to convert to-and-from that to GncNumeric for communicating with the rest of the GnuCash API. I suggest QofSession as the first C++ class to play with SWIGing. It’s fairly simple and using it is the first step in using the bindings. Regards, John Ralls _______________________________________________ gnucash-devel mailing list gnucash-devel@gnucash.org https://lists.gnucash.org/mailman/listinfo/gnucash-devel
