python 批量修改/替换数据的实例

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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

20161111

96.0

5.400000

20161111

-0.010000

NaN

NaN

1

20161123

1.0

7.500000

20161123

2.100000

2.090000

NaN

20161213

5.0

7.500000

20161213

0.000000

2.100000

2.090000

20161226

37.0

6.258571

20161226

-1.241429

-1.241429

0.858571

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