Reporting system and potentially Python
jralls at ceridwen.us
Thu Jul 7 17:58:11 EDT 2011
On Jul 7, 2011, at 4:24 PM, Christian Stimming wrote:
> Am Donnerstag, 7. Juli 2011 schrieb John Ralls:
>>>> So I am OK with needing to get more familiar with something
>>>> such as Python, C, or Java to do the work, but I don't want to get knee
>>>> deep in a major feature patch to find out something else is preferred.
>>> If you are able to insert some python code that will display some report,
>>> I will fully agree this to be a worthwhile goal and I will happily apply
>>> your patches to SVN trunk.
>> Christian: Please don't accept Python code into Gnucash. Python has
>> version-to-version compatibility problems, and I've found with pure-python
>> applications like Gramps that it requires bundling a Python interpreter
>> with the application so that everyone gets the same version.
> You do realize that gnucash already comes with a lot of python code for quite
> some time being, don't you? Namely we already have the python wrappers for the
> core engine object being generated by SWIG for approx. 2-3 years by now. More
> recently, there has been an optional python module added so that the framework
> is already there to do some real new features with that.
> To me, issues with version incompatibilities in python are indeed a drawback
> of that language, but all languages have drawbacks and advantages. The clear
> advantages to allow python code in gnucash is that
> * the python wrappers for all engine objects are already there, so using them
> is a rather efficient way of using your time to implement something new
> * the python language is significantly more easy to learn and suits the
> "normal programmer's thinking" much better than other languages
> wrappers for all of our engine objects, so this is a very boring task that
> is significantly difficult to work with in a serious way. It's much more like
> Scheme than one would initially expect, and it suffers the same problem than
> Scheme: Only a smaller set of programmers really understand the concepts
> behind it well enough to create good architectures in that language.
> With this being said, we had Tim's question here: "I'd like to improve
> something with the reports; which language should I use." With the above
> advantages and disadvantages, I still think the most efficient way for Tim to
> spend his time is creating a report in python. And yes, I still think I will
> happily add related python code into the optional src/python/ module, even
> though we know about the limitations of python w.r.t. version issues. But we
> also know about its benefits. My cost-benefit comparison so far still turns
> out python as the suggested way to proceed for now.
There's a big difference between a toy Python console for hackers and reports at the core of user interaction with Gnucash. Like src/gnc, src/optional.gtkmm, and src/cmakefilemodules, src/optional/python isn't appropriate to include in a general-distrbution binary. The standard reports *must* be included in such a binary.
I think Tim is looking for something different than you think, but I'll let him speak for himself.
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