在Pandas酒吧地块上注释带有价值的酒吧 [英] Annotate bars with values on Pandas bar plots

问题描述

我正在寻找一种方法来在Pandas酒吧中注释我的酒吧，其值（舍入）在我的DataFrame中。

I looking for a way to annotate my bars in a Pandas bar plot with the values (rounded) in my DataFrame.

>>> df=pd.DataFrame({'A':np.random.rand(2),'B':np.random.rand(2)},index=['value1','value2'] )         
>>> df
                 A         B
  value1  0.440922  0.911800
  value2  0.588242  0.797366

I想获得这样的东西：

I would like to get something like this:

我尝试过这个，但注释都以xthicks为中心：

I tried with this, but the annotations are all centered on the xthicks:

>>> ax = df.plot(kind='bar') 
>>> for idx, label in enumerate(list(df.index)): 
        for acc in df.columns:
            value = np.round(df.ix[idx][acc],decimals=2)
            ax.annotate(value,
                        (idx, value),
                         xytext=(0, 15), 
                         textcoords='offset points')

推荐答案

您可以直接从轴的补丁获取：

You get it directly from the axes' patches:

In [35]: for p in ax.patches:
    ax.annotate(str(p.get_height()), (p.get_x() * 1.005, p.get_height() * 1.005))

你想要调整字符串可以使用 p.get_width（）中的宽度，但这应该让您开始。除非您在某处跟踪偏移量，否则可能无法使用堆叠的条形图。

You'll want to tweak the string formatting and the offsets to get things centered, maybe use the width from p.get_width(), but that should get you started. May not worked with stacked barplots unless you track the offsets somewhere.

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