You are not doing anything wrong.
Page() class does not support all values of:

- rvcontentformat: Serialization format used for rvdifftotext and expected for output of content.
One of the following values: text/x-wiki, application/json, text/plain, text/javascript, text/css

but only the default (I think it is text/x-wiki).

If you want to save json, you need to subclass Page() and overwrite save() method.
I did it in proofreadpage.py. You can use it as reference.

Unfortunately, this works only when saving.
There is currently no way to load using rvcontentformat other that text/plain.

I tried once but gave it up. See https://gerrit.wikimedia.org/r/#/c/224852/.
You can try resurrect that concept.

I replied to https://www.mediawiki.org/w/index.php?title=Topic:U8qudxbgf2xujfsw&topic_showPostId=u8rrlm6pbjgyg7gz&fromnotif=1#flow-post-u8rrlm6pbjgyg7gz -- take a look at this example -- you need to set "contentmodel": "Tabular.JsonConfig"

Thanks for the info, Mpaa. I guess a can derive a basic saver for Tabular Data from your proofreadpage.py following Yurik statements. I'll let you know whether it works. On the other hand, reading is not actually a problem, I think I can use the MediaWiki API to retrieve the content. At the end of the day, it's the saving feature the actual stopper. Best regards

I do not know about Tabular Data. However, it would be nice to expand the library with new features.
Not having the possibility of getting different contentmodel/format is a Pywikibot limitation which would be nice to remove.
If you feel like to 'standardize' your new class within pywikibot, you're welcome :-)

Hi all, I've successfully posted TabularData through pywikibot following your code :-) However, I haven't used "contentmodel" (Tabular.JsonConfig does not seem to be supported) but only "contentformat" (set to "application/json"). That is, simply overwriting the save() method with

kwargs['contentformat'] = 'application/json'

And using json.dumps with ensure_ascii set to False has been enough for writing (see here)

And yes, there should be a new class called TabularDataPage (same for maps). However, I'm far from being a Python expert and feel as if my code is possibly not suitable to be included in a professional package as Pywikibot (moreover, I find TabularData a quite inconvenient format given that I mostly work with pandas, which does not directly support this format). On the other hand, I haven't investigated yet how to read TabularData and possibly is not that simple (however, I guess that something similar is currently being done with wikidata Items, as they're also modeled as json structures, and therefore shouldn't be impossible).

To sum up, I'm trying to write some nice code to write and read TabularData and will be glad to contribute it to Pywikibot. However, I'm unsure about how to do it. Any guidance will be appreciated

You can start from here: https://www.mediawiki.org/wiki/Manual:Pywikibot/Development