python 怎么将列表中的字典安照某一个key输出到csv，python如何把字典数据存储进csv文件

示例代码

import csv
fieldnames=["A","B","C"]#数据列名

dicts=[
              {'A': '1', 'B': '2', 'C':3},
              {'A': '2', 'B': '3', 'C':4},
              {'A': '3', 'B': '4', 'C':5},
              {'A': '4', 'B': '5', 'C':6},
              {'A': '5', 'B': '6', 'C':7},
              {'A': '9', 'B': '7', 'C':8},
             ]
        

with open('test.csv', 'a', newline='',encoding='utf_8_sig') as f: 
    writer = csv.DictWriter(f,fieldnames=fieldnames)
    writer.writeheader()  
    writer.writerows(dicts) 

实例代码：