Pandas、条形图注释

Question

如何正确给 Pandas 条形图添加注释？

我正在关注Bar Chart Annotations with Pandas and MPL ，但不知何故我无法将其放入我自己的代码中 - this is as far as I can go 。怎么了？

我还发现了以下代码from here :

def autolabel(rects):
    # attach some text labels
    for rect in rects:
        height = rect.get_height()
        ax.text(rect.get_x() + rect.get_width()/2., 1.05*height,
                '%d' % int(height),
                ha='center', va='bottom')

autolabel(rects1)
autolabel(rects2)

但我也不知道如何将其应用到我的代码中。请帮忙。

更新:

谢谢@CT Zhu的回答。但是，在您的水平条中，您仍然将文本放置在条的顶部，但我需要文本显示在它们内部或沿着它们，就像我引用的文章中的那样，

他/她说的地方，

"I am very parital to horizontal bar charts, as I really think they are easier to read, however, I understand that a lot of people would rather see this chart implemented in a regular bar chart. So, here is the code to do that; you will notice that a few things have changed in order to create the annotation"*

Answer 1

看来您的autolabel函数需要一个补丁列表，假设您的绘图仅将这些条形作为其补丁，我们可以这样做:

df = pd.DataFrame({'score':np.random.randn(6),
                   'person':[x*3 for x in list('ABCDEF')]})

def autolabel(rects):
    x_pos = [rect.get_x() + rect.get_width()/2. for rect in rects]
    y_pos = [rect.get_y() + 1.05*rect.get_height() for rect in rects]
    #if height constant: hbars, vbars otherwise
    if (np.diff([plt.getp(item, 'width') for item in rects])==0).all():
        scores = [plt.getp(item, 'height') for item in rects]
    else:
        scores = [plt.getp(item, 'width') for item in rects]
    # attach some text labels
    for rect, x, y, s in zip(rects, x_pos, y_pos, scores):
        ax.text(x, 
                y,
                '%s'%s,
                ha='center', va='bottom')

ax = df.set_index(['person']).plot(kind='barh', figsize=(10,7), 
              color=['dodgerblue', 'slategray'], fontsize=13)

ax.set_alpha(0.8)
ax.set_title("BarH")#,fontsize=18)
autolabel(ax.patches)

ax = df.set_index(['person']).plot(kind='bar', figsize=(10,7), 
              color=['dodgerblue', 'slategray'], fontsize=13)

ax.set_alpha(0.8)
ax.set_title("Bar")#,fontsize=18)
autolabel(ax.patches)