In [1]:

    

import numpy as np
import pandas as pd
from pandas import Series,DataFrame


    

In [2]:

    

years = [1990,1991,1992,2008,2012,2015,1987,1969,2013,2008,1999]


    

In [3]:

    

decade_bins = [1960,1970,1980,1990,2000,2010,2020]


    

In [4]:

    

decade_cat = pd.cut(years,decade_bins)

decade_cat


    

    
Out[4]:





[(1980, 1990], (1990, 2000], (1990, 2000], (2000, 2010], (2010, 2020], ..., (1980, 1990], (1960, 1970], (2010, 2020], (2000, 2010], (1990, 2000]]
Length: 11
Categories (6, object): [(1960, 1970] < (1970, 1980] < (1980, 1990] < (1990, 2000] < (2000, 2010] < (2010, 2020]]

In [6]:

    

decade_cat.categories


    

    
Out[6]:





Index([u'(1960, 1970]', u'(1970, 1980]', u'(1980, 1990]', u'(1990, 2000]',
       u'(2000, 2010]', u'(2010, 2020]'],
      dtype='object')

In [7]:

    

pd.value_counts(decade_cat)


    

    
Out[7]:





(2010, 2020]    3
(1990, 2000]    3
(2000, 2010]    2
(1980, 1990]    2
(1960, 1970]    1
(1970, 1980]    0
dtype: int64

In [8]:

    

pd.cut(years,2,precision=1)


    

    
Out[8]:





[(1969, 1992], (1969, 1992], (1969, 1992], (1992, 2015], (1992, 2015], ..., (1969, 1992], (1969, 1992], (1992, 2015], (1992, 2015], (1992, 2015]]
Length: 11
Categories (2, object): [(1969, 1992] < (1992, 2015]]

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