import numpy as np
import pandas as pd
rndrange = pd.DateRange('1/1/2012', periods=72, freq='H')
rndseries = pd.Series(np.random.randn(len(rndrange)), index=rndrange)
rndseries.head()
data = [rndseries, rndseries, rndseries, rndseries, rndseries, rndseries]
Python Pandas -- Random sampling of time series