Annotate bars with values on Pandas bar plots


I was looking for a way to annotate my bars in a Pandas bar plot with the rounded numerical values from 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 would like to get something like this:

bar plot annotation example

I tried with this code sample, but the annotations are all centered on the x ticks:

>>> 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)
                        (idx, value),
                         xytext=(0, 15), 
                         textcoords="offset points")

Answer rating: 180

You get it directly from the axes" patches:

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

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. It may not work with stacked bar plots unless you track the offsets somewhere.

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