对dataframe绘图并保存：

ax = df.plot() 
fig = ax.get_figure()
fig.savefig('fig.png')

 

可以制定列，对该列各取值作统计：

label_dis = df.label.value_counts()
ax = label_dis.plot(title='label distribution', kind='bar', figsize=(18, 12))
fig = ax.get_figure()
fig.savefig('label_distribution.png')