Seaborn Heatmap Colorbar Label as Percentage

Question

Given this heat map:

import numpy as np; np.random.seed(0)
import seaborn as sns; sns.set()
uniform_data = np.random.rand(10, 12)
ax = sns.heatmap(uniform_da         


        

Answer 1

You should get the colour bar object and then get the relevant axis object:

import matplotlib.pyplot as plt
from matplotlib.ticker import PercentFormatter

fig, ax = plt.subplots()
sns.heatmap(df, ax=ax, cbar_kws={'label': 'My Label'})
cbar = ax.collections[0].colorbar
cbar.ax.yaxis.set_major_formatter(PercentFormatter(1, 0))