human
I wrote the below code

    def plot_group(group, ax):
        ax.hist(group.dropna().values, bins=bins, **kwargs)
    xrot = (xrot or rot)
    (fig, axes) = _grouped_plot(plot_group, data, column=column, by=by, sharex=sharex, sharey=sharey, ax=ax, figsize=figsize, layout=layout, rot=rot)
    _set_ticks_props(axes, xlabelsize=xlabelsize, xrot=xrot, ylabelsize=ylabelsize, yrot=yrot)
    fig.subplots_adjust(bottom=0.15, top=0.9, left=0.1, right=0.9, hspace=0.5, wspace=0.3)
    return axes

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def grouped_hist(data, column=None, by=None, ax=None, bins=50, figsize=None, layout=None, sharex=False, sharey=False, rot=90, grid=True, xlabelsize=None, xrot=None, ylabelsize=None, yrot=None, **kwargs):