11月14日总结
赋值
用索引自动对齐新增列的数据:
In [45]: s1 = pd.Series([1, 2, 3, 4, 5, 6], index=pd.date_range('20130102', periods=6))
In [46]: s1
Out[46]:
2013-01-02 1
2013-01-03 2
2013-01-04 3
2013-01-05 4
2013-01-06 5
2013-01-07 6
Freq: D, dtype: int64
In [47]: df['F'] = s1
按标签赋值:
In [48]: df.at[dates[0], 'A'] = 0
按位置赋值:
In [49]: df.iat[0, 1] = 0