matplot superíndices la columna del gráfico de columnas de tipo de pila

import matplotlib.pyplot as plt


# 下面柱子标值
def autolabel(ax, rects):
    """Attach a text label above each bar in *rects*, displaying its height."""
    for rect in rects:
        height = rect.get_height()
        ax.annotate('{}'.format(height),
                    xy=(rect.get_x() + rect.get_width() / 2, height/2),
                    xytext=(0, 3),  # 3 points vertical offset
                    textcoords="offset points",
                    ha='center', va='bottom')


# 上面柱子标值
def autolabel_up(ax, rects, bottom_rects):
    """Attach a text label above each bar in *rects*, displaying its height."""
    for i in range(len(rects)):
       height = rects[i].get_height()/2+bottom_rects[i].get_height()
       ax.annotate('{}'.format(rects[i].get_height()),
                   xy=(rects[i].get_x() + rects[i].get_width() / 2, height),
                   xytext=(0, 3),  # 3 points vertical offset
                   textcoords="offset points",
                   ha='center', va='bottom')


labels = ['G1', 'G2', 'G3', 'G4', 'G5']
men_means = [20, 35, 30, 35, 27]
women_means = [25, 32, 34, 20, 25]
men_std = [2, 3, 4, 1, 2]
women_std = [3, 5, 2, 3, 3]
width = 0.35       # the width of the bars: can also be len(x) sequence

fig, ax = plt.subplots()

rect1 = ax.bar(labels, men_means, width, label='Men')
rect2 = ax.bar(labels, women_means, width, bottom=men_means, label='Women')
autolabel(ax, rect1)
autolabel_up(ax, rect2, rect1)
ax.set_ylabel('Scores')
ax.set_title('Scores by group and gender')
ax.legend()

plt.show()

Gráfico de resultado: