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CSV/Excel文件与SQL数据库的读取与写入

CSV/Excel文件与SQL数据库的读取与写入
#python数据分析

Python的基本写入与读取,csv和SQL

import csvwith open(path+'data.csv','r'as f:    csv_reader=csv.reader(f)    lines=[line for line in csv_reader]
  • 读取csv文件表格
  •  csv.reader()将每一行当成一个列表对象返回。

  • for line in csv_reader:循环遍历 csv 里每一行,每一行临时变量叫 line
 csv_reader=csv.DictReader(f)
  • 自动把第一行当作表头字段名
  • 每一行数据返回字典,key = 表头,value = 当前行对应单元格;
工具
每行返回
取值方式
csv.reader
list
row [0], row [1] 下标取值
csv.DictReader
dict
row ["date"], row ["no1"] 列名取值
import sqlite3 as sq3con=sq3.connect(path+'numbs.db')query='CREATE TABLE numbs (Date date,No1 real,No2 real)'con.execute(query)con.commit()q=con.executeq('SELECT * FROM sqlite_master').fetchall()
  • 作用:打开 / 创建 SQLite 数据库文件连接,返数据库连接对象 con
  • CREATE TABLE numbs:创建一张名为 numbs的数据表:
    Date date字段名:Date;类型:date(SQLite 无原生 date 类型,底层实际存文本 / 数字,用于存储日期字符串如:2026-07-07);No1 字段名:No1;real类型:浮点数,小数 / 整数都能存)
  • execute() 用来执行 SQL 语句:执行建表,磁盘文件 numbs.db内生成 numbs 表结构;
  • sqlite_master是 SQLite 内置系统元数据表,数据库里所有表、索引、视图的信息都存在这里。

    .fetchall() 一次性取全部查询结果,返回一个元组列表

方法
返回值
作用
.fetchall()list[tuple]
获取全部剩余行,元组列表
.fetchone()tuple
 / None
只取下一行,单行元组;无数据返回 None
.fetchmany(n)list[tuple]
取 n 行,返回元组列表
data.to_csv(filename +'.csv')

把文件名为保存为filename, csv格式,写入磁盘。

pd.read_csv(filename +'.csv')

读取这个文件。

data[:100000].to_excel(filename +'.xlsx')df =pd.read_excel(filename +'.xlsx','Sheet1')
  • 写入Excel格式;

  • 读取这个表格的第一张表名为Sheet1

Pandas 常用数据读写格式对照表
格式
输入方法
输出方法
备注说明
CSV
pd.read_csv().to_csv()
文本文件
XLS/XLSX
pd.read_excel().to_excel()
电子表格
HDF
pd.read_hdf().to_hdf()
HDF5 数据库
SQL
pd.read_sql().to_sql()
SQL 表
JSON
pd.read_json().to_json()
JavaScript 对象
MSGPACK
pd.read_msgpack().to_msgpack()
可移植二进制格式
HTML
pd.read_html().to_html()
HTML 代码
GBQ
pd.read_gbq().to_gbq()
Google Big Query
DTA
pd.read_stata().to_stata()
格式 104、105 等
任意
pd.read_clipboard().to_clipboard()
例如,从 HTML 页面复制
任意
pd.read_pickle().to_pickle()
(结构化) Python 对象
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-07-11 19:18:20 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/847228.html
  2. 运行时间 : 0.203606s [ 吞吐率:4.91req/s ] 内存消耗:4,703.27kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=037553c10510dbf28f30e45519fb1afc
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  135. /yingpanguazai/ssd/ssd1/www/wwww.yeyulingfeng.com/app/controller/Es.php ( 3.30 KB )
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  1. CONNECT:[ UseTime:0.000865s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001173s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000609s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002769s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001148s ]
  6. SELECT * FROM `set` [ RunTime:0.000525s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001158s ]
  8. SELECT * FROM `article` WHERE `id` = 847228 LIMIT 1 [ RunTime:0.000952s ]
  9. UPDATE `article` SET `lasttime` = 1783768700 WHERE `id` = 847228 [ RunTime:0.015976s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000621s ]
  11. SELECT * FROM `article` WHERE `id` < 847228 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001092s ]
  12. SELECT * FROM `article` WHERE `id` > 847228 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006963s ]
  13. SELECT * FROM `article` WHERE `id` < 847228 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001889s ]
  14. SELECT * FROM `article` WHERE `id` < 847228 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006042s ]
  15. SELECT * FROM `article` WHERE `id` < 847228 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001844s ]
0.206965s