Seaborn Catplot set values over the bars

Question

I plotted a catplot in seaborn like this

import seaborn as sns
import pandas as pd

data  = {'year': [2016, 2013, 2014, 2015, 2016, 2013, 2014, 2015, 2016, 2013, 2014, 2015, 2016, 2013, 2014, 2015, 2016, 2013, 2014, 2015], 'geo_name': ['Michigan', 'Michigan', 'Michigan', 'Michigan', 'Washtenaw County, MI', 'Washtenaw County, MI', 'Washtenaw County, MI', 'Washtenaw County, MI', 'Ann Arbor, MI', 'Ann Arbor, MI', 'Ann Arbor, MI', 'Ann Arbor, MI', 'Philadelphia, PA', 'Philadelphia, PA', 'Philadelphia, PA', 'Philadelphia, PA', 'Ann Arbor, MI Metro Area', 'Ann Arbor, MI Metro Area', 'Ann Arbor, MI Metro Area', 'Ann Arbor, MI Metro Area'], 'geo': ['04000US26', '04000US26', '04000US26', '04000US26', '05000US26161', '05000US26161', '05000US26161', '05000US26161', '16000US2603000', '16000US2603000', '16000US2603000', '16000US2603000', '16000US4260000', '16000US4260000', '16000US4260000', '16000US4260000', '31000US11460', '31000US11460', '31000US11460', '31000US11460'], 'income': [50803.0, 48411.0, 49087.0, 49576.0, 62484.0, 59055.0, 60805.0, 61003.0, 57697.0, 55003.0, 56835.0, 55990.0, 39770.0, 37192.0, 37460.0, 38253.0, 62484.0, 59055.0, 60805.0, 61003.0], 'income_moe': [162.0, 163.0, 192.0, 186.0, 984.0, 985.0, 958.0, 901.0, 2046.0, 1688.0, 1320.0, 1259.0, 567.0, 424.0, 430.0, 511.0, 984.0, 985.0, 958.0, 901.0]}
df = pd.DataFrame(data)

g = sns.catplot(x='year', y='income', data=df, kind='bar', hue='geo_name', legend=True)
g.fig.set_size_inches(15,8)
g.fig.subplots_adjust(top=0.81,right=0.86)  

I am getting an output like shown below

I want to add the values of each bar on its top in K representation. For example in 2013 the bar for Michigan is at 48411 so I want to add the value 48.4K on top of that bar. Likewise for all the bars.

Answer 1

• Use matplotlib.pyplot.bar_label as of matplotlib v3.4.2
  • See Adding value labels on a matplotlib bar chart for other plotting options related to the new method.
  • See the matplotlib: Bar Label Demo page for additional formatting options.
  • Use the fmt parameter for simple formats, and the labels parameter for customized string formatting.
  • For horizontal bars, use v.get_width instead of v.get_height.
• Tested in python 3.11, pandas 1.5.3, matplotlib 3.7.1, seaborn 0.12.2

For single plot only

g = sns.catplot(data=df, x='year', y='income', kind='bar', hue='geo_name', legend=True, height=6, aspect=2)

# extract the matplotlib axes_subplot objects from the FacetGrid
ax = g.facet_axis(0, 0)  # or ax = g.axes.flat[0]

# iterate through the axes containers
for c in ax.containers:
    labels = [f'{(v.get_height() / 1000):.1f}K' for v in c]
    ax.bar_label(c, labels=labels, label_type='edge')

For single or multiple plots

g = sns.catplot(data=df, x='year', y='income', kind='bar', col='geo_name', col_wrap=3)

g.fig.subplots_adjust(top=0.9)
g.fig.suptitle('Bar Count with Annotations')

# iterate through axes
for ax in g.axes.ravel():
    
    # add annotations
    for c in ax.containers:
        labels = [f'{(v.get_height() / 1000):.1f}K' for v in c]
        ax.bar_label(c, labels=labels, label_type='edge')
    ax.margins(y=0.2)

plt.show()

• Also works for grouped bars in Facets (subplots)

df = sns.load_dataset('titanic')
g = sns.catplot(data=df, kind='count', x='survived', hue='sex', col='class')

# iterate through axes
for ax in g.axes.ravel():
    
    # add annotations
    for c in ax.containers:
        # add custom labels with the labels=labels parameter if needed
        # labels = [f'{h}' if (h := v.get_height()) > 0 else '' for v in c]
        ax.bar_label(c, label_type='edge')
    ax.margins(y=0.2)