我在这里遇到了很多问题,但没有任何帮助。我尝试获取我的Pandas Dataframe的Datetime索引。尝试重采样asfreq。索引已经是一个Datetime对象,但它保持NONE频率。
dfz = sale.loc[(sale.Open == 1) & (sale.Promo == 0) & (sale.Sales > 0), ["Sales", "Customers"]]
print(dfz.asfreq('M').index)
print(dfz.index)
结果是:
DatetimeIndex([], dtype='datetime64[ns]', name='Date', freq='M')
DatetimeIndex(['2015-07-20', '2015-07-20', '2015-07-20', '2015-07-20',
'2015-07-20', '2015-07-20', '2015-07-20', '2015-07-20',
'2015-07-20', '2015-07-20',
...
'2013-01-06', '2013-01-06', '2013-01-06', '2013-01-06',
'2013-01-06', '2013-01-06', '2013-01-06', '2013-01-06',
'2013-01-06', '2013-01-06'],
dtype='datetime64[ns]', name='Date', length=467463, freq=None)
Sales Customers
为什么它在asfreq的结果中向我显示频率,但是当我调用索引时它仍然为NONE?