python - 基于来自另一个文件的 zip 合并更新 csv 文件中的城市

Question

我有 csv 文件 file1.csv

Territory   Sales     Zipcode    city   statename
00001000      10         99764    

另一个包含城市详细信息的文件

Zipcode   city      Statename 
99764     Northway   Alaska

我想像下面这样更新 file1.csv

Territory   Sales     Zipcode    city      statename
00001000      10         99764   Northway   Alaska

它就像 SQL 中典型的更新语句

UPDATE file1 SET file1.value = (SELECT table2.CODE
                                  FROM file2 
                                  WHERE table1.value = table2.DESC)

我如何在 python 中执行此操作？

Answer 1

import pandas as pd
file1 = pd.read_csv('file1.csv')
file2 = pd.read_csv('file2.csv')
df = pd.merge(file1,file2,how='left', on = 'Zipcode')
df.to_csv('new_file.csv')