plotting fails in pandas==0.25.0

[BioinfoTongLI]

Same code works in pandas==0.24.0
When updated to 0.25.0 it fails and return the following error:

Traceback (most recent call last):
......
  File "/home/tongli/miniconda3/envs/maars/lib/python3.7/site-packages/dabest/_classes.py", line 1235, in plot
    out = EffectSizeDataFramePlotter(self, **all_kwargs)
  File "/home/tongli/miniconda3/envs/maars/lib/python3.7/site-packages/dabest/plotter.py", line 377, in EffectSizeDataFramePlotter
    **group_summary_kwargs)
  File "/home/tongli/miniconda3/envs/maars/lib/python3.7/site-packages/dabest/plot_tools.py", line 162, in gapped_lines
    quantiles = data.groupby(x)[y].quantile([0.25, 0.75])\
  File "/home/tongli/miniconda3/envs/maars/lib/python3.7/site-packages/pandas/core/groupby/groupby.py", line 1908, in quantile
    interpolation=interpolation,
  File "/home/tongli/miniconda3/envs/maars/lib/python3.7/site-packages/pandas/core/groupby/groupby.py", line 2248, in _get_cythonized_result
    func(**kwargs)  # Call func to modify indexer values in place
  File "pandas/_libs/groupby.pyx", line 692, in pandas._libs.groupby.group_quantile
TypeError: must be real number, not list

[josesho]

I also see this error, after upgrading to pandas==0.25.

The last traceback pointing to dabest is

~/anaconda3/envs/bleeding-edge/lib/python3.7/site-packages/dabest/plot_tools.py in gapped_lines(data, x, y, type, offset, ax, line_color, gap_width_percent, **kwargs)
    160 
    161     medians   = data.groupby(x)[y].median().reindex(index=group_order)
--> 162     quantiles = data.groupby(x)[y].quantile([0.25, 0.75])\
    163                                   .unstack()\
    164                                   .reindex(index=group_order)

Something has changed in df.groupby().quantile(). I will let you know when this is fixed. If you squash this earlier, feel free to do a pull request!

Thanks,
Joses

[BioinfoTongLI]

Hello, FYI, this is not an issue causes by dabest.
Something is broken while Cythonizing the groupby.quantile in the version 0.25 of Pandas.
pandas-dev/pandas#20405 (comment)
pandas-dev/pandas#27526 (comment)
I believe the best solution, in short term, is to force people stay at 0.24

[josesho]

Ah ok, thanks @BioinfoTongLI for following this up! Let's wait for pandas=0.25.1 to be released.

[schlegelp]

Just to add that I am still getting an error (albeit different from OP) with pandas 0.25.1 and dabest 0.2.4 running the iris example in the README:

In [6]: iris_dabest.mean_diff.plot();                                           
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-6-be7fec275da2> in <module>
----> 1 iris_dabest.mean_diff.plot();

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/dabest/_classes.py in plot(self, color_col, raw_marker_size, es_marker_size, swarm_label, contrast_label, swarm_ylim, contrast_ylim, custom_palette, swarm_desat, halfviolin_desat, halfviolin_alpha, float_contrast, show_pairs, group_summaries, group_summaries_offset, fig_size, dpi, swarmplot_kwargs, violinplot_kwargs, slopegraph_kwargs, reflines_kwargs, group_summary_kwargs, legend_kwargs)
   1233         del all_kwargs["self"]
   1234 
-> 1235         out = EffectSizeDataFramePlotter(self, **all_kwargs)
   1236 
   1237         return out

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/dabest/plotter.py in EffectSizeDataFramePlotter(EffectSizeDataFrame, **plot_kwargs)
    375                          gap_width_percent=1.5,
    376                          type=group_summaries, ax=rawdata_axes,
--> 377                          **group_summary_kwargs)
    378 
    379 

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/dabest/plot_tools.py in gapped_lines(data, x, y, type, offset, ax, line_color, gap_width_percent, **kwargs)
    160 
    161     medians   = data.groupby(x)[y].median().reindex(index=group_order)
--> 162     quantiles = data.groupby(x)[y].quantile([0.25, 0.75])\
    163                                   .unstack()\
    164                                   .reindex(index=group_order)

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/groupby/groupby.py in quantile(self, q, interpolation)
   1951             indices = np.concatenate(arrays)
   1952             assert len(indices) == len(result)
-> 1953             return result.take(indices)
   1954 
   1955     @Substitution(name="groupby")

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/series.py in take(self, indices, axis, is_copy, **kwargs)
   4430 
   4431         indices = ensure_platform_int(indices)
-> 4432         new_index = self.index.take(indices)
   4433 
   4434         if is_categorical_dtype(self):

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/indexes/multi.py in take(self, indices, axis, allow_fill, fill_value, **kwargs)
   2030             allow_fill=allow_fill,
   2031             fill_value=fill_value,
-> 2032             na_value=-1,
   2033         )
   2034         return MultiIndex(

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/indexes/multi.py in _assert_take_fillable(self, values, indices, allow_fill, fill_value, na_value)
   2058                 taken = masked
   2059         else:
-> 2060             taken = [lab.take(indices) for lab in self.codes]
   2061         return taken
   2062 

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pandas/core/indexes/multi.py in <listcomp>(.0)
   2058                 taken = masked
   2059         else:
-> 2060             taken = [lab.take(indices) for lab in self.codes]
   2061         return taken
   2062 

IndexError: index 6 is out of bounds for size 6

[BioinfoTongLI]

@josesho It's my bad, I shouldn't close this...
I thought it will be solved rapidly...
Clearly it is not the case. I saw the issues is closed in pandas repo.
Someone can try a nightly build of pandas to see if it works?

[josesho]

The pandas developers tried a patch with 0.25.1, but there's still a problem...

I've opened an issue with them pandas-dev/pandas#28312.

I think the best option for now is to stick with pandas==0.24.