Band graph with matplotlib

import numpy as np
import matplotlib.pyplot as plt

N, K = 4, 3
data = np.random.rand(N, K)
tick_labels = ["a", "b", "c", "d"]
labels = ["x", "y", "z"]

normalized = data / data.sum(axis=1, keepdims=True)
cumulative = np.zeros(N)
tick = np.arange(N)

for k in range(K):
    color = plt.cm.viridis(float(k) / K, 1)
    plt.barh(tick, normalized[:, k], left=cumulative, color=color, label=labels[k])
#   plt.bar(tick, normalized[:, k], bottom=cumulative, color=color, label=labels[k])
    cumulative += normalized[:, k]

plt.xlim((0, 1))
# plt.ylim((0, 1))
plt.yticks(tick, tick_labels)
# plt.xticks(tick, tick_labels)
plt.legend()
plt.show()

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