plotnine.geoms.geom_bar

class plotnine.geoms.geom_bar(mapping: Aes | None = None, data: DataLike | None = None, **kwargs: Any)

Bar plot

Usage

geom_bar(mapping=None, data=None, stat='count', position='stack', na_rm=False,
         inherit_aes=True, show_legend=None, raster=False, width=None,
         **kwargs)

Only the data and mapping can be positional, the rest must be keyword arguments. **kwargs can be aesthetics (or parameters) used by the stat.

Parameters:

mappingaes, optional

Aesthetic mappings created with aes(). If specified and inherit.aes=True, it is combined with the default mapping for the plot. You must supply mapping if there is no plot mapping.

Aesthetic	Default value
x
y
alpha	1
color	None
fill	'#595959'
group
linetype	'solid'
size	0.5

The bold aesthetics are required.

datadataframe, optional

The data to be displayed in this layer. If None, the data from from the ggplot() call is used. If specified, it overrides the data from the ggplot() call.

statstr or stat, optional (default: stat_count)

The statistical transformation to use on the data for this layer. If it is a string, it must be the registered and known to Plotnine.

positionstr or position, optional (default: position_stack)

Position adjustment. If it is a string, it must be registered and known to Plotnine.

na_rmbool, optional (default: False)

If False, removes missing values with a warning. If True silently removes missing values.

inherit_aesbool, optional (default: True)

If False, overrides the default aesthetics.

show_legendbool or dict, optional (default: None)

Whether this layer should be included in the legends. None the default, includes any aesthetics that are mapped. If a bool, False never includes and True always includes. A dict can be used to exclude specific aesthetis of the layer from showing in the legend. e.g show_legend={'color': False}, any other aesthetic are included by default.

rasterbool, optional (default: False)

If True, draw onto this layer a raster (bitmap) object even ifthe final image is in vector format.

widthfloat, optional (default None)

Bar width. If None, the width is set to 90% of the resolution of the data.

See also

plotnine.geoms.geom_histogram

Examples

import pandas as pd
import numpy as np

from plotnine import (
    ggplot,
    aes,
    geom_bar,
    coord_flip,
    theme_classic
)
from plotnine.data import mpg

Bar chart

geom_bar() makes the height of the bar proportional to the number of cases in each group

mpg.head()

	manufacturer	model	displ	year	cyl	trans	drv	cty	hwy	fl	class
0	audi	a4	1.8	1999	4	auto(l5)	f	18	29	p	compact
1	audi	a4	1.8	1999	4	manual(m5)	f	21	29	p	compact
2	audi	a4	2.0	2008	4	manual(m6)	f	20	31	p	compact
3	audi	a4	2.0	2008	4	auto(av)	f	21	30	p	compact
4	audi	a4	2.8	1999	6	auto(l5)	f	16	26	p	compact

ggplot(mpg) + geom_bar(aes(x='class'))

<Figure Size: (640 x 480)>

ggplot(mpg) + geom_bar(aes(x='class', fill='drv'))

<Figure Size: (640 x 480)>

(
    ggplot(mpg)
    + geom_bar(aes(x='class', fill='drv'))
    + coord_flip()
    + theme_classic()
)

<Figure Size: (640 x 480)>