Re: [PATCH] ob-python results handling for dicts, dataframes, arrays, and plots

[Liu Hui]

> > Here we can use '{}'.format(df.index.name) to show the name of index
>
> Patch has been updated to print the index name when it is non-None.

Thanks! It would be nice to also support MultiIndex names using
`result.index.names', e.g.

#+begin_src python :results table
import numpy as np
import pandas as pd

df = pd.DataFrame({
    "A": ["foo", "bar", "foo", "bar", "foo", "bar", "foo", "foo"],
    "B": ["one", "one", "two", "three", "two", "two", "one", "three"],
    "C": np.random.randn(8),
    "D": np.random.randn(8)})
return df.groupby(["A", "B"]).agg('sum').round(3)
#+end_src

Another problem is the display of objects like datetime, e.g.

#+begin_src python :results table
import pandas as pd
s = pd.Series(range(3), index=pd.date_range("2000", freq="D", periods=3))
return s.to_frame()
#+end_src

#+RESULTS:
|           | 0                             |   |
|-----------+-------------------------------+---|
| Timestamp | (2000-01-01 00:00:00 freq= D) | 0 |
| Timestamp | (2000-01-02 00:00:00 freq= D) | 1 |
| Timestamp | (2000-01-03 00:00:00 freq= D) | 2 |

#+begin_src python
from pathlib import Path
import numpy as np

return {'a': 1, 'path': Path('/'), 'array': np.zeros(3)}
#+end_src

#+RESULTS:
| a     | 1         |           |
| path  | PosixPath | (/)       |
| array | array     | ((0 0 0)) |

I think these objects need to be shown in a single column rather than
two. Besides, if the python code becomes too complex finally, I think
maintaining the python code outside the ob-python.el, as suggested by
Ihor, is a good idea.