python pandas 将sql文件变为csv文件

# 创建导包-连接数据库-连接pandas-读取sql文件-装入csv文件
import pandas as pd
import pymysql as pm
# 连接数据库
con = pm.connect(
    host='localhost',
    port=3306,
    user='root',
    password='123456',
    database='flowers'
)
cur = con.cursor()
sql="select * from consumer"
cur.execute(sql)
pdf=pd.read_sql(sql,con)
pdf.to_csv("sql.csv")
con.commit();
con.close();