0. 以时间作为序列的索引
>> from datetime import datetime
>> dates = [datetime(
2011,
1, i) for i
in [
2,
5,
7,
8,
10,
12]]
>> ts = pd
.Series(np
.random.randn(
6), index=dates)
>> ts
2011-
01-
02 -
1.157516
2011-
01-
05 0.755876
2011-
01-
07 0.299113
2011-
01-
08 0.446367
2011-
01-
10 -
1.700069
2011-
01-
12 0.261344
dtype: float64
进一步查看 ts 的成员:
>> type(ts)
pandas.core.series.Series
>> ts.index
...
>> ts.index.dtype
dtype(
'<M8[ns]')
>> ts.index[
0]
Timestamp(
'2011-01-02 00:00:00')
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