most recent version of pandas code example

Example: pandas

df = pd.DataFrame(np.random.randn(1000, 4), index=ts.index,
   .....:                   columns=['A', 'B', 'C', 'D'])
   .....: 

In [137]: df = df.cumsum()

In [138]: plt.figure()
Out[138]: 


In [139]: df.plot()
Out[139]: 

In [140]: plt.legend(loc='best')
Out[140]: