ENH: Add basic support for pd.DataFrame.hist pd.Series.hist

[pratapvardhan]

df = pd.DataFrame(np.random.randn(1000, 4), columns=list('ABCD'))
df.hist()

df['A'].hist()

[jakevdp]

What's the difference between these functions and data.plot.hist()?

Also, I'm not certain these methods were intended to be accessible to alternative plotting backends (see pandas-dev/pandas#28159 (comment) & discussion there)

[pratapvardhan]

I think, the default df.plot.hist() overlays each column's distribution in a single plot. Whereas, df.hist() creates a grid (a plot for each column).

Also, if we enable, altair backend, df.hist() fails if we don't define it.

[jakevdp]

Also, if we enable, altair backend, df.hist() fails if we don't define it.

Right, but it's unclear whether it was intentional to allow plotting backends to override df.hist(). See the linked discussion above.

[pratapvardhan]

Understood. I'm okay with anything we decide. Will see how the pandas PR evolves.

[jakevdp]

Thinking on this more, we may as well add this. If pandas deprecates these functionalities, we can always remove them.

Mind adding some tests for this? Thanks!

[pratapvardhan]

@jakevdp -- tests added.

[jakevdp]

Thanks!