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在进行数据操作时，经常会根据条件批量的修改数据，如以下数据，按照日期的条件，将部门日期下的promotion改为1
| tot_qty | price | date | price_delta1 | price_delta2 | price_delta3 | promotion | |
|---|---|---|---|---|---|---|---|
| created_date | |||||||
| 20160419 | 1.0 | 5.410000 | 20160419 | NaN | NaN | NaN | 0 |
| 20161111 | 96.0 | 5.400000 | 20161111 | -0.010000 | NaN | NaN | 1 |
| 20161123 | 1.0 | 7.500000 | 20161123 | 2.100000 | 2.090000 | NaN | 0 |
| 20161213 | 5.0 | 7.500000 | 20161213 | 0.000000 | 2.100000 | 2.090000 | 0 |
| 20161226 | 37.0 | 6.258571 | 20161226 | -1.241429 | -1.241429 | 0.858571 | 0 |
方法：遍历每一行，判断条件，执行修改
for i in range(len(data)): line=data.iloc[i,:] if line['date']in (20170416,20170417,20170418,20170616,20170617,20170618,20170816,20170817,20170818,20171109,20171110,20171111): data[i:i+1]['promotion']=1
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