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python入门之数据存储

  • 2026-03-26 09:18:14
python入门之数据存储

一、Python存储数据的多样方式

Python提供了多种存储数据的方法,下面将对常见的几种进行介绍:

(一)json文件存储

JSON(JavaScript Object Notation)是一种轻量级的数据交换格式。它在Python中的应用十分广泛,主要优势在于能够轻松地解决编码问题。

其数据结构类似于Python中的字典和列表,这使得它非常易于读写和解析,进而能够提升网络传输效率。以下是一个简单的示例,将一个包含用户信息的字典存储为JSON文件:

import jsonuser_info = {"name""Alice""age"25"city""New York"}with open("user_info.json""w"as f:    json.dump(user_info, f)

(二)csv文件存储

CSV(Comma - Separated Values)格式在数据存储中也很常见,Python可以很方便地将数据存储为这种格式。这种格式的文件可以使用Excel等工具打开浏览,方便查看数据。例如,将一个简单的二维列表数据存储为CSV文件:

import csvdata = [["John"22], ["Bob"28], ["Mary"30]]with open("data.csv""w", newline=''as csvfile:    writer = csv.writer(csvfile)    writer.writerows(data)

(三)MySQL数据库存储

MySQL数据库存储是Python数据存储中最常用的方式之一。在Python中,我们可以通过相应的库来连接MySQL数据库并进行操作。以下是一个简单的连接数据库并插入数据的示例:

import mysql.connectormydb = mysql.connector.connect(    host="localhost",    user="your_username",    password="your_password",    database="your_database")mycursor = mydb.cursor()sql = "INSERT INTO customers (name, address) VALUES (%s, %s)"val = ("John""Highway 21")mycursor.execute(sql, val)mydb.commit()

(四)Redis数据库存储

在Python中使用Redis数据库存储数据具有方便、速度快的优点。不过需要注意的是,从Redis中取出的数据是二进制形式,通常需要转换为字符串进行操作。以下是一个简单的Python操作Redis存储数据的示例:

import redisr = redis.Redis(host='localhost', port=6379, db=0)r.set('key''value')data = r.get('key')# 转换为字符串data_str = data.decode()

(五)Mongdb数据库存储

使用Python将数据存储到MongoDB数据库的优点是它对数据结构的要求比较宽松。不过,从MongoDB中取出的数据往往需要通过整理脚本来处理。以下是一个简单的Python操作MongoDB存储数据的示例:

from pymongo import MongoClientclient = MongoClient("mongodb://localhost:27017/")db = client["mydatabase"]collection = db["mycollection"]data = {"name""Tom""age"35}collection.insert_one(data)

二、Python数据存储到文件的方式

Python有多种将数据存储到文件的方法,下面逐一介绍:

(一)保存数据到txt

例如,通过requests获取网页源代码,用pyquery解析库解析,将爬取的内容保存到txt文件。以下是一个简化的示例:

import requestsfrom pyquery import PyQuery as pqurl = "https://example.com"response = requests.get(url)doc = pq(response.text)content = doc.text()with open("web_content.txt""w"as f:    f.write(content)

(二)保存数据到csv

在Python中,我们可以使用csv模块来操作CSV文件。创建writer对象,使用writerow()写入一行数据,writerows()写入多行数据,可写入列表或字典数据到csv文件。例如:

import csvdata_list = [["apple"5], ["banana"3], ["orange"4]]with open("fruits.csv""w", newline=''as csvfile:    writer = csv.writer(csvfile)    writer.writerows(data_list)

(三)使用pandas保存数据

Pandas是一个强大的数据分析库,它支持多种文件格式的读写。我们可以将爬取的数据储存为DataFrame对象,然后方便地保存到excel、csv文件等。例如:

import pandas as pddata = {"col1": [123], "col2": ["a""b""c"]}df = pd.DataFrame(data)df.to_csv("data_pandas.csv", index=False)

三、Python存储数据之TXT、JSON、CSV和数据库格式

(一)TXT格式存储

以保存知乎热门话题到txt文件为例,通过requests获取网页源代码,用pyquery解析,使用open()打开文件,write()写入内容:

import requestsfrom pyquery import PyQuery as pqurl = "https://www.zhihu.com/billboard"response = requests.get(url)doc = pq(response.text)topics = doc('.HotList-itemTitle').text()with open("zhihu_topics.txt""w"as f:    f.write(topics)

(二)JSON格式存储

在JSON数据存储中,以数组和对象形式进行操作。使用load(), dumps()将json文件字符互相转化为json对象,可设置缩进。例如:

import jsondata = [{"name""Peter""age"30}, {"name""Lily""age"28}]# 将数据转换为JSON字符串并写入文件with open("data.json""w"as f:    json_str = json.dumps(data, indent=4)    f.write(json_str)# 从文件中读取JSON字符串并转换为对象with open("data.json""r"as f:    loaded_data = json.load(f)

(三)CSV格式存储

使用csv.writer()初始化写入对象,writerow()写入一行数据,可将数据写入到excel中。例如:

import csvheader = ["Name""Score"]data = [["Tom"90], ["Jerry"85]]with open("scores.csv""w", newline=''as csvfile:    writer = csv.writer(csvfile)    writer.writerow(header)    writer.writerows(data)

(四)数据库存储

以mysql为例,连接数据库、创建数据库、执行插入语句等操作来存储数据到关系型数据库:

import mysql.connector# 连接数据库mydb = mysql.connector.connect(    host="localhost",    user="your_username",    password="your_password")mycursor = mydb.cursor()# 创建数据库mycursor.execute("CREATE DATABASE IF NOT EXISTS mydb")mydb.database = "mdb"# 创建表并插入数据mycursor.execute("CREATE TABLE IF NOT EXISTS students (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255), age INT)")sql = "INSERT INTO students (name, age) VALUES (%s, %s)"val = ("David"23)mycursor.execute(sql, val)mydb.commit()

四、Python存储和读取用户生成数据

(一)保存用户生成数据

使用json.dump()可以存储用户输入的名字等数据到文件中。以下是一个示例:

import jsonusername = input("Please enter your name: ")with open("user_name.json""w"as f:    json.dump(username, f)

(二)读取用户生成数据

使用json.load()读取存储在文件中的用户生成数据,并进行相应的输出和处理。例如:

import jsontry:with open("user_name.json""r"as f:        username = json.load(f)        print(f"Welcome back, {username}!")except FileNotFoundError:    print("No user name found.")

(三)重构存储和读取用户生成数据的程序

通过重构代码,将存储和读取用户生成数据的功能划分为多个函数,使代码更清晰、易于理解和扩展。例如:

import jsondefsave_username(username):with open("user_name.json""w"as f:        json.dump(username, f)defload_username():try:with open("user_name.json""r"as f:return json.load(f)except FileNotFoundError:returnNoneif __name__ == "__main__":    username = input("Please enter your name: ")    save_username(username)    loaded_username = load_username()if loaded_username:        print(f"Welcome back, {loaded_username}!")else:        print("No user name found.")

五、总结

Python在数据存储方面有着丰富的方法和广泛的应用场景。从简单的文件存储如TXT、CSV、JSON,到强大的数据库存储如MySQL、Redis、MongoDB等,这些存储方式在不同的领域都发挥着重要作用。

总之,Python在数据存储方面的重要性将日益凸显,它将继续作为数据处理和程序开发中的重要工具,为各类应用提供强大的支持。

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  1. CONNECT:[ UseTime:0.001140s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001924s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001073s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000737s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001806s ]
  6. SELECT * FROM `set` [ RunTime:0.000651s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002050s ]
  8. SELECT * FROM `article` WHERE `id` = 482499 LIMIT 1 [ RunTime:0.001318s ]
  9. UPDATE `article` SET `lasttime` = 1774589194 WHERE `id` = 482499 [ RunTime:0.001780s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000641s ]
  11. SELECT * FROM `article` WHERE `id` < 482499 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001016s ]
  12. SELECT * FROM `article` WHERE `id` > 482499 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001169s ]
  13. SELECT * FROM `article` WHERE `id` < 482499 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007874s ]
  14. SELECT * FROM `article` WHERE `id` < 482499 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007397s ]
  15. SELECT * FROM `article` WHERE `id` < 482499 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.026845s ]
0.160459s