【Python Pandas】根据一列或几列的值，对另一列赋值

[

pandas.Da_taFrame 根据条件新建列并赋值_ importnum_py_asnp import_pandas_aspd _da_ta = {‘city’: [‘Beijing’,’Shanghai’,’Guangzhou’,’Shenzhen’,’Hangzhou’,’Ch_on_gqing’], ‘year’: [2016,2016,2015,2017,2016,2016],…

](https://blog.csdn.net/weixin_43064185/article/details/103994136)

04-19
4791

12-04
1372

03-10
4648

08-19
2 万 +

04-12
4474

03-26
356

02-03
599

12-03
1399

04-22
5507

11-26
1585

12-05
212

10-20
5850

09-16
852

12-28
548

03-05
6 万 +

[

import numpy as np import pandas as pd da_ta = {‘city’: [‘Beijing’, ‘Shanghai’, ‘Guangzhou’, ‘Shenzhen’, ‘Hangzhou’, ‘Ch_on_gqing’], ‘year’: [2016,2016,2015,2017,2016, 2016], ‘populati_on‘:…

](https://blog.csdn.net/qq_30565883/article/details/79443090)

04-03
3421

01-29
406
https://blog.csdn.net/liangbilin/article/details/109187275
https://blog.csdn.net/liangbilin/article/details/109187275