python怎么写爬虫脚本_Python爬虫脚本

#!C:\Users\12550\AppData\Local\Programs\Python\Python37\python.exe

# -*- coding: utf-8 -*-

from urllib.request import urlopen

from bs4 import BeautifulSoup

import pymysql

import urllib.request

import re

from urllib.error import URLError, HTTPError

conn = pymysql.connect(host='127.0.0.1', user='root', passwd='root', db='test', charset='utf8')

db = conn.cursor()

curr_url = ''

# 请求网页

def get_html(url):

global curr_url

user_agent = 'Mozilla/6.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.6796.99 Safari/537.36'

response = urllib.request.Request(url)

response.add_header('User-Agent', user_agent)

response = urllib.request.urlopen(response)

html = BeautifulSoup(response.read(), "html.parser", from_encoding='gbk')

return html

def get_list(url, level=1, pid=0, get_level=2):

data = [];

level_arr = {'1': 'provincetr', '2': 'citytr', '3': 'countytr', '4': 'towntr', '5': 'villagetr'}

try:

print(url)

html = get_html(url)

c_url = url

tr_list = html.findAll('tr', {'class': level_arr[str(level)]})

for tr in tr_list:

region_name, href, page = '', '', ''

td_list = tr.findAll('td')

for td in td_list:

region_name = td.get_text();

# 判断是否存在该省份

if (level == 1):

sql = "select * from region where region_name='" + region_name + "'"

db.execute(sql)

exist = db.fetchone()

if(exist):

continue

# 判断是否全数字-非法则跳过

if (region_name.isdigit()):

continue

if (region_name):

sql = "insert into region(region_name,pid,level,url) value('" + region_name + "','" + str(

pid) + "','" + str(level) + "','" + url + "')"

db.execute(sql)

db.execute('SELECT LAST_INSERT_ID();')

last_id = db.fetchone()[0]

if (td.a):

page = td.a.attrs['href']

pattern = re.compile(r'\w*.html')

url = re.sub(pattern, page, c_url)

if (level <= get_level):

get_list(url, level + 1, last_id)

# 每个省份执行完成，则提交

if (level == 1):

conn.commit()

return data;

except HTTPError as e:

# 如果有出错，则回滚

conn.rollback()

print(e) # HTTP Error 502: Proxy Error

url = 'http://www.stats.gov.cn/tjsj/tjbz/tjyqhdmhcxhfdm/2017/index.html'

get_list(url)

print('执行完成')

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作者：只是个宝宝

来源：优快云

原文：https://blog.youkuaiyun.com/qq_27974479/article/details/85634360

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