db_config ={
  'host': '127.0.0.1',
  'port': 3306,
  'user': 'root',
  'password': '',
  'db': 'pytest',
  'charset': 'utf8'
}

# -*- coding:utf-8 -*-
from urllib import request
from bs4 import BeautifulSoup
import pymysql
# mysql连接信息（字典形式）
db_config ={
  'host': '127.0.0.1',
  'port': 3306,
  'user': 'root',
  'password': '',
  'db': 'pytest',
  'charset': 'utf8'
}
# 获得数据库连接
connection = pymysql.connect(**db_config)
# 数据库配置，获得连接（参数方式）
# connection = pymysql.connect(host='127.0.0.1',
#            port=3306,
#            user='root',
#            password='',
#            db='pytest',
#            charset='utf8')
url = r'http://www.jianshu.com/'
# 模拟浏览器头
headers = {
  'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'
}
page = request.Request(url, headers=headers)
page_info = request.urlopen(page).read().decode('utf-8')
soup = BeautifulSoup(page_info, 'html.parser')
urls = soup.find_all('a', 'title')
try:
  # 获得数据库游标
  with connection.cursor() as cursor:
    sql = 'insert into titles(title, url) values(%s, %s)'
    for u in urls:
      # 执行sql语句
      cursor.execute(sql, (u.string, r'http://www.jianshu.com'+u.attrs['href']))
  # 事务提交
  connection.commit()
finally:
  # 关闭数据库连接
  connection.close()