Detailed explanation of the method of crawling 51cto data in Python and storing it in MySQL

[Related learning recommendations: python tutorial】

Experimental environment

1. Install Python 3.7

2. Install requests, bs4, pymysql module

Experimental steps 1. Installation environment and module

Please refer to https://www. jb51.net/article/194104.htm

2.Write code

# 51cto 博客页面数据插入mysql数据库
# 导入模块
import re
import bs4
import pymysql
import requests

# 连接数据库账号密码
db = pymysql.connect(host='172.171.13.229',
           user='root', passwd='abc123',
           db='test', port=3306,
           charset='utf8')
# 获取游标
cursor = db.cursor()

def open_url(url):
  # 连接模拟网页访问
  headers = {
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '
           'Chrome/57.0.2987.98 Safari/537.36'}
  res = requests.get(url, headers=headers)
  return res

# 爬取网页内容
def find_text(res):
  soup = bs4.BeautifulSoup(res.text, 'html.parser')

  # 博客名
  titles = []
  targets = soup.find_all("a", class_="tit")
  for each in targets:
    each = each.text.strip()
    if "置顶" in each:
      each = each.split(' ')[0]
    titles.append(each)

  # 阅读量
  reads = []
  read1 = soup.find_all("p", class_="read fl on")
  read2 = soup.find_all("p", class_="read fl")
  for each in read1:
    reads.append(each.text)
  for each in read2:
    reads.append(each.text)

  # 评论数
  comment = []
  targets = soup.find_all("p", class_='comment fl')
  for each in targets:
    comment.append(each.text)

  # 收藏
  collects = []
  targets = soup.find_all("p", class_='collect fl')
  for each in targets:
    collects.append(each.text)

   # 发布时间
  dates=[]
  targets = soup.find_all("a", class_='time fl')
  for each in targets:
    each = each.text.split('：')[1]
    dates.append(each)

  # 插入sql 语句
  sql = """insert into blog (blog_title,read_number,comment_number, collect, dates)
  values( '%s', '%s', '%s', '%s', '%s');"""
  # 替换页面 \xa0
  for titles, reads, comment, collects, dates in zip(titles, reads, comment, collects, dates):
    reads = re.sub('\s', '', reads)
    comment = re.sub('\s', '', comment)
    collects = re.sub('\s', '', collects)
    cursor.execute(sql % (titles, reads, comment, collects，dates))
    db.commit()
    pass

# 统计总页数
def find_depth(res):
  soup = bs4.BeautifulSoup(res.text, 'html.parser')
  depth = soup.find('li', class_='next').previous_sibling.previous_sibling.text
  return int(depth)

# 主函数
def main():
  host = "https://blog.51cto.com/13760351"
  res = open_url(host) # 打开首页链接
  depth = find_depth(res) # 获取总页数

  # 爬取其他页面信息
  for i in range(1, depth + 1):
    url = host + '/p' + str(i) # 完整链接
    res = open_url(url) # 打开其他链接
    find_text(res) # 爬取数据

  # 关闭游标
  cursor.close()
  # 关闭数据库连接
  db.close()

if __name__ == '__main__':
  main()

3..MySQL creates the corresponding table

CREATE TABLE `blog` (
 `row_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
 `blog_title` varchar(52) DEFAULT NULL COMMENT '博客标题',
 `read_number` varchar(26) DEFAULT NULL COMMENT '阅读数量',
 `comment_number` varchar(16) DEFAULT NULL COMMENT '评论数量',
 `collect` varchar(16) DEFAULT NULL COMMENT '收藏数量',
 `dates` varchar(16) DEFAULT NULL COMMENT '发布日期',
 PRIMARY KEY (`row_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

## 4. Run the code and check the effect:

Improved version:

Improved content:

1. A certain item in the database Some fields can only retain numbers

2. By default, the content crawled is string, which stores some fields of the database. It is best to change them to integers to facilitate subsequent database operations

1. The code is as follows:

import re
import bs4
import pymysql
import requests

# 连接数据库
db = pymysql.connect(host='172.171.13.229',
           user='root', passwd='abc123',
           db='test', port=3306,
           charset='utf8')
# 获取游标
cursor = db.cursor()

def open_url(url):
  # 连接模拟网页访问
  headers = {
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '
           'Chrome/57.0.2987.98 Safari/537.36'}
  res = requests.get(url, headers=headers)
  return res

# 爬取网页内容
def find_text(res):
  soup = bs4.BeautifulSoup(res.text, 'html.parser')

  # 博客标题
  titles = []
  targets = soup.find_all("a", class_="tit")
  for each in targets:
    each = each.text.strip()
    if "置顶" in each:
      each = each.split(' ')[0]
    titles.append(each)

  # 阅读量
  reads = []
  read1 = soup.find_all("p", class_="read fl on")
  read2 = soup.find_all("p", class_="read fl")
  for each in read1:
    reads.append(each.text)
  for each in read2:
    reads.append(each.text)

  # 评论数
  comment = []
  targets = soup.find_all("p", class_='comment fl')
  for each in targets:
    comment.append(each.text)

  # 收藏
  collects = []
  targets = soup.find_all("p", class_='collect fl')
  for each in targets:
    collects.append(each.text)

  # 发布时间
  dates=[]
  targets = soup.find_all("a", class_='time fl')
  for each in targets:
    each = each.text.split('：')[1]
    dates.append(each)

  # 插入sql 语句
  sql = """insert into blogs (blog_title,read_number,comment_number, collect, dates)
  values( '%s', '%s', '%s', '%s', '%s');"""
  # 替换页面 \xa0
  for titles, reads, comment, collects, dates in zip(titles, reads, comment, collects, dates):
    reads = re.sub('\s', '', reads)
    reads=int(re.sub('\D', "", reads)) #匹配数字，转换为整型
    comment = re.sub('\s', '', comment)
    comment = int(re.sub('\D', "", comment)) #匹配数字，转换为整型
    collects = re.sub('\s', '', collects)
    collects = int(re.sub('\D', "", collects)) #匹配数字，转换为整型
    dates = re.sub('\s', '', dates)
    cursor.execute(sql % (titles, reads, comment, collects,dates))
    db.commit()
    pass

# 统计总页数
def find_depth(res):
  soup = bs4.BeautifulSoup(res.text, 'html.parser')
  depth = soup.find('li', class_='next').previous_sibling.previous_sibling.text
  return int(depth)

# 主函数
def main():
  host = "https://blog.51cto.com/13760351"
  res = open_url(host) # 打开首页链接
  depth = find_depth(res) # 获取总页数

  # 爬取其他页面信息
  for i in range(1, depth + 1):
    url = host + '/p' + str(i) # 完整链接
    res = open_url(url) # 打开其他链接
    find_text(res) # 爬取数据

  # 关闭游标
  cursor.close()
  # 关闭数据库连接
  db.close()

#主程序入口
if __name__ == '__main__':
  main()

2. Create the corresponding table

CREATE TABLE `blogs` (
 `row_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
 `blog_title` varchar(52) DEFAULT NULL COMMENT '博客标题',
 `read_number` int(26) DEFAULT NULL COMMENT '阅读数量',
 `comment_number` int(16) DEFAULT NULL COMMENT '评论数量',
 `collect` int(16) DEFAULT NULL COMMENT '收藏数量',
 `dates` varchar(16) DEFAULT NULL COMMENT '发布日期',
 PRIMARY KEY (`row_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

3. Run the code and verify

Upgraded version

In order It allows novices to use this program, and can package this project into an exe format file, so that others can run the code using a computer, which is very convenient!

1. Improve the code:

#末尾修改为：
if __name__ == '__main__':
  main()
  print("\n\t\t所有数据已成功存放数据库！!! \n")
  time.sleep(5)

2. Install the packaging module pyinstaller (cmd installation)

pip install pyinstaller -i https://pypi.tuna. tsinghua.edu.cn/simple/

3. Python code packaging

1. Switch to the path where the code needs to be packaged

2. Run pyinstaller -F test03.py in the cmd window (test03 is the project name)

4. Check the exe package

dist will appear after packaging Directory, the package will be in this directory

5. Run the exe package and check the effect

Check database

Related learning recommendations:

mysql tutorial

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