pandas dataframe 修改列名的方法
加之rename函数，用字典的形式替换式的修改，
df.rename(columns={'a':'A',"b":"B"})
df
三、obj[‘col’] = value 方法
直接对 DataFrame 直接赋值即可
in [6]: data['d'] = 0
in [7]: data
out[7]:
a b c d
0 1 2 3 0
1 4 5 6 0
2 7 8 9 0
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实例操作：
import pandas as pd
import sqlite3
db_file="./cnblogs_blog_weifeng1463.20230912103223.db"
conn = sqlite3.connect(db_file, isolation_level=None)
db_df = pd.read_sql_query("SELECT Id,Title,DateAdded,Body FROM blog_Content",conn)
new_df=db_df.rename(columns={'Id':'id','Title':'title','DateAdded':'date','Body':'body'})
new_df['author_id']= 1
new_df['subtitle']= 1
new_df['img_url']= "http://123.com"
print(new_df)
#db_df.to_csv('database.csv',encoding='utf_8_sig')