python 批量修改/替换数据的实例
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
foriinrange(len(data)): line=data.iloc[i,:] ifline['date']in(20170416,20170417,20170418,20170616,20170617,20170618,20170816,20170817,20170818,20171109,20171110,20171111): data[i:i+1]['promotion']=1
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