How to add count labels to barplots in Seaborn Facetgrid? - count

Question

I have a table as below:
data = {'Platform':['Server A', 'Server A', 'Server A', 'Server A', 'Server A', 'Server A', 'Server B', 'Server B', 'Server B', 'Server B', 'Server B', 'Server B', 'Server C', 'Server C', 'Server C', 'Server C', 'Server C', 'Server C', 'Server C', 'Server C', 'Server C', 'Server D', 'Server D', 'Server D', 'Server D', 'Server D', 'Server D', 'Server D', 'Server D', 'Server D'],
'Grade':['Excellent', 'Average', 'Excellent', 'Average', 'Excellent', 'Average','Excellent', 'Average', 'Excellent', 'Average', 'Excellent', 'Average', 'Excellent', 'Excellent', 'Excellent', 'Average', 'Average', 'Average', 'Bad', 'Bad', 'Bad', 'Excellent', 'Excellent', 'Excellent', 'Average', 'Average', 'Average', 'Bad', 'Bad', 'Bad'],
'Colour':['Yellow', 'Yellow', 'Green', 'Green', 'Black', 'Black', 'Yellow', 'Yellow', 'Green', 'Green', 'Black', 'Black', 'Yellow', 'Green', 'Black', 'Yellow', 'Green', 'Black', 'Yellow', 'Green', 'Black', 'Yellow', 'Green', 'Black', 'Yellow', 'Green', 'Black', 'Yellow', 'Green', 'Black'],
'Count':[4115314,3879421,4240053,4019764,5398596,5019698,4652935,4140395,4786148,4306763,5691699,5181920,4046690,4202843,5320250,3772534,3945649,4936451,4242814,4490521,5341960,4926092,5095662,5816803,4404762,4587462,5298671,4948988,5146153,5720155]
}
df = pd.DataFrame(data, columns = ['Platform', 'Grade', 'Colour', 'Count'])
And I am looking to create a FacetGrid containing bar plots for the Counts for each Platform, Grade, and Colour.
g = sns.FacetGrid(df, col="Platform")
g.map_dataframe(sns.barplot, x="Grade", y="Counts", hue="Colour")
g.set_axis_labels("Grade", "Counts")
g.add_legend()
g.set_titles(col_template="{col_name}", row_template="{row_name}")
I am able to get a FacetGrid fine with this code. However, how do I add labels for Counts at the top of each bar?

Answer 1

I would use a custom function passed to g.map():
def annotate_bars(ax=None, fmt='.2f', **kwargs):
ax = plt.gca() if ax is None else ax
for p in ax.patches:
ax.annotate('{{:{:s}}}'.format(fmt).format(p.get_height()), (p.get_x() + p.get_width() / 2., p.get_height()),
xytext=(0, 5),textcoords='offset points',
ha='center', va='center', **kwargs)
df = pd.DataFrame(data)
g = sns.FacetGrid(df, col="Platform")
g.map_dataframe(sns.barplot, x="Grade", y="Counts", hue="Colour")
g.map(annotate_bars, fmt='.2g', fontsize=8, color='k')
g.set_axis_labels("Grade", "Counts")
g.add_legend()
g.set_titles(col_template="{col_name}", row_template="{row_name}")