python - How to save Pandas pie plot to a file?

Question

I have the following code:

import pandas as pd
import matplotlib
matplotlib.style.use('ggplot')
df = pd.DataFrame({ 'sample1':['foo','bar','bar','qux'], 'score':[5,9,1,7]})
sum_df = df.groupby("sample1").sum()
pie = sum_df.plot(kind="pie", figsize=(6,6), legend = False, use_index=False, subplots=True, colormap="Pastel1")

Which makes the pie chart. What I want to do then is to save it to a file. But why this fail?

fig = pie.get_figure()
fig.savefig("~/Desktop/myplot.pdf")

I get this error:

'numpy.ndarray' object has no attribute 'get_figure'

Answer 1

Well pie is a numpy array because the return type for DataFrame.plot() is a numpy array of matplotlib.AxesSubplot objects.

fig = pie[0].get_figure()
fig.savefig("~/Desktop/myplot.pdf")