CLN/DEPR: remove deprecated pandas.rpy module (GH9602)

[jorisvandenbossche]

Closes #9602

[jreback]

I would remove everything here except for the top warning, then put a link to the previous page of the built docs.

[jorisvandenbossche]

Yep, the docs were still 'to do'. What I was thinking to do is update the current examples to just use the corresponding rpy2 functions. So then there is still some documentation on how to use it (for the updating, I can refer to docs of previous version).

[jreback]

sure if that works, just make a note (e.g. import at the top and indicate), you are importing an external library to do this.

[jreback]

just a doc comment, otherwise lgtm.

[jreback]

good to go?

[sinhrks]

it's nice to update ecosystem doc to describe rpy2 and PypeR.

[jorisvandenbossche]

@sinhrks do you know how maintained PypeR is, and whether pandas is supported well or not?

[sinhrks]

@jorisvandenbossche their website is below, but can't find actual repo (looks to be not maintainanced 2014)?

http://www.webarray.org/softwares/PypeR/

The package has use_pandas to handle DataFrame and Series. From their source impl, rpy2 is expected to work better.

        use_pandas: Used as a boolean value. A False value will disable pandas
            even if it has been imported. 

Pls drop PypeR description if it is not appropriate.

[codecov-io]

Current coverage is 85.97% (diff: 100%)

Merging #15142 into master will increase coverage by 0.28%

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  Files           145        140     -5   
  Lines         51430      51244   -186   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
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- Hits          44070      44057    -13   
+ Misses         7360       7187   -173   
  Partials          0          0          

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[jreback]

http://pandas-docs.github.io/pandas-docs-travis/r_interface.html#rpy

something not defined here?

[jorisvandenbossche]

Hmm, sigh. This worked locally, but I now see this only worked because I didn't activate pandas2ri. But if I don't activate pandas2ri, the second example does not work. I can't really get my head around rpy2's conversion/activate/dispatch rules and object model ..
(will do a PR to fix this)