bar_pandas_groupby_nested.py¶
A grouped bar chart using a cleaned up version of the Auto MPG dataset.
This examples demonstrates automatic handing of Pandas GroupBy objects and
colormapping nested factors with factor_cmap
. A hover tooltip displays
information for each bar.
Details
- Sampledata
- Bokeh APIs
- More info
- Keywords
bars, categorical, colormap, groupby, pandas
from bokeh.palettes import Spectral5
from bokeh.plotting import figure, show
from bokeh.sampledata.autompg import autompg_clean as df
from bokeh.transform import factor_cmap
df.cyl = df.cyl.astype(str)
df.yr = df.yr.astype(str)
group = df.groupby(['cyl', 'mfr'])
index_cmap = factor_cmap('cyl_mfr', palette=Spectral5, factors=sorted(df.cyl.unique()), end=1)
p = figure(width=800, height=300, title="Mean MPG by # Cylinders and Manufacturer",
x_range=group, toolbar_location=None, tooltips=[("MPG", "@mpg_mean"), ("Cyl, Mfr", "@cyl_mfr")])
p.vbar(x='cyl_mfr', top='mpg_mean', width=1, source=group,
line_color="white", fill_color=index_cmap, )
p.y_range.start = 0
p.x_range.range_padding = 0.05
p.xgrid.grid_line_color = None
p.xaxis.axis_label = "Manufacturer grouped by # Cylinders"
p.xaxis.major_label_orientation = 1.2
p.outline_line_color = None
show(p)