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Kernel: Python 2 (SageMath)
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

s = pd.Series([1,3,5,np.nan,7,9])
s
0 1.0 1 3.0 2 5.0 3 NaN 4 7.0 5 9.0 dtype: float64
dates = pd.date_range('20130101', periods=6)
dates
DatetimeIndex(['2013-01-01', '2013-01-02', '2013-01-03', '2013-01-04', '2013-01-05', '2013-01-06'], dtype='datetime64[ns]', freq='D')
df = pd.DataFrame(np.random.randn(6,4), index=dates, columns=list('ABCD'))
df