pandas_book.py 文件源码

def date_op():
    start = pd.date_range('2015-01-01', periods=50)
    #print start
    print type(start)

    date_list = [datetime.datetime(2017, 1, 1), datetime.datetime(2017, 1, 2), datetime.datetime(2017, 1, 3),
                 datetime.datetime(2017, 1, 4)]
    df = pd.DataFrame(np.random.randn(4), index=date_list)
    print df
    print df.index[2]
    format_line()

    s_x = pd.date_range('2000-1-1', periods=1000)
    df_x = pd.DataFrame(np.arange(2000).reshape(1000, 2), index=s_x)
    print df_x
    print df_x.ix['2002/09/24']
    print df_x[1]
    #?????????
    #?????ix
    print df_x.ix['2001-09']