基础页面：https://movie.douban.com/top250
代码：
from time import sleep
from requests import get
from bs4 import BeautifulSoup
import re
import pymysql
db = pymysql.connect(host='localhost',
user='root',
password='123456',
db='douban',
charset='utf8mb4',
cursorclass=pymysql.cursors.DictCursor
)
try:
with db.cursor() as cursor:
sql = "CREATE TABLE IF NOT EXISTS `top250` ("
"`id` int(6) NOT NULL AUTO_INCREMENT,"
"`top` int(6) NOT NULL,"
"`page-code` int(6) NOT NULL,"
"`title` varchar(255) NOT NULL,"
"`origin-title` varchar(255),"
"`score` float NOT NULL,"
"`theme` varchar(255) NOT NULL,"
"PRIMARY KEY(`id`)"
") ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1;"
cursor.execute(sql,)
finally:
db.commit()
base_url = 'https://movie.douban.com/top250'
header = {
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8',
'Accept-Encoding': 'gzip, deflate, br',
'Accept-Language': 'zh-CN,zh;q=0.9',
'Cache-Control': 'max-age=0',
'Connection': 'keep-alive',
'Cookie': 'xxx',
'Host': 'movie.douban.com',
'Referer': 'https://movie.douban.com/chart',
'Upgrade-Insecure-Requests': '1',
'User-Agent': 'xxx'
}
def crawler(url=None, headers=None, delay=1):
r = get(url=url, headers=headers, timeout=3)
soup = BeautifulSoup(r.text, 'html.parser')
page_tag = soup.find('span', attrs={'class': 'thispage'})
page_code = re.compile(r'<span class="thispage">(.*)</').findall(str(page_tag))[0]
movie_ranks = soup.find_all('em', attrs={'class': ''})
movie_titles = soup.find_all('div', attrs={'class': 'hd'})
movie_scores = soup.find_all('span', attrs={'class': 'rating_num'})
movie_themes = soup.find_all('span', attrs={'class': 'inq'})
next_page = soup.find('link', attrs={'rel': 'next'})
for ranks, titles, scores, themes in zip(movie_ranks, movie_titles, movie_scores, movie_themes):
rank = re.compile(r'<em class="">(.*)</').findall(str(ranks))
regex_ts = re.compile(r'<span class="title">(.*)</').findall(str(titles))
title = regex_ts[0]
score = re.compile(r'<span class="rating_num" property="v:average">(.*)</').findall(str(scores))[0]
theme = re.compile(r'<span class="inq">(.*)</').findall(str(themes))[0]
try:
origin_title = regex_ts[1]
origin_title = re.compile(r'./.(.+)').findall(origin_title)[0]
with db.cursor() as cursor:
sql = "INSERT INTO `top250` (`top`, `page-code`, `title`, `origin-title`, `score`, `theme`)"
" VALUES (%s, %s, %s, %s, %s, %s)"
cursor.execute(sql, (rank, page_code, title, origin_title, score, theme,))
except IndexError:
with db.cursor() as cursor:
sql = "INSERT INTO `top250` (`top`, `page-code`, `title`, `score`, `theme`)"
" VALUES (%s, %s, %s, %s, %s)"
cursor.execute(sql, (rank, page_code, title, score, theme,))
finally:
db.commit()
if next_page is not None:
headers['Referer'] = url
next_url = base_url + re.compile(r'<link href="(.*)" rel="next">').findall(str(next_page))[0]
sleep(delay)
crawler(url=next_url, headers=headers, delay=3)
crawler(base_url, header, 0)
db.close()
结果：
mysql> select top,title,score from top250 where id = 175;
+-----+--------+-------+
| top | title | score |
+-----+--------+-------+
| 176 | 罗生门 | 8.7 |
+-----+--------+-------+
1 row in set (0.00 sec)
mysql> select top,title,page-code,score from top250 where id = 175;
ERROR 1054 (42S22): Unknown column 'page' in 'field list'
mysql> select top,page-code,title,score from top250 where id = 175;
ERROR 1054 (42S22): Unknown column 'page' in 'field list'
mysql> select page-code from top250 where id = 175;
ERROR 1054 (42S22): Unknown column 'page' in 'field list'
mysql> describe top250
-> ;
+--------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+----------------+
| id | int(6) | NO | PRI | NULL | auto_increment |
| top | int(6) | NO | | NULL | |
| page-code | int(6) | NO | | NULL | |
| title | varchar(255) | NO | | NULL | |
| origin-title | varchar(255) | YES | | NULL | |
| score | float | NO | | NULL | |
| theme | varchar(255) | NO | | NULL | |
+--------------+--------------+------+-----+---------+----------------+
7 rows in set (0.32 sec)
mysql> select page-code from top250 where id = 175;
ERROR 1054 (42S22): Unknown column 'page' in 'field list'
mysql> select origin-title from top250 where id = 175;
ERROR 1054 (42S22): Unknown column 'origin' in 'field list'
mysql> select origin_title from top250 where id = 175;
ERROR 1054 (42S22): Unknown column 'origin_title' in 'field list'
mysql> select * from top250 where id = 175;
+-----+-----+-----------+--------+--------------+-------+-------------------+
| id | top | page-code | title | origin-title | score | theme |
+-----+-----+-----------+--------+--------------+-------+-------------------+
| 175 | 176 | 8 | 罗生门 | 羅生門 | 8.7 | 人生的N种可能性。 |
+-----+-----+-----------+--------+--------------+-------+-------------------+
1 row in set (0.00 sec)
mysql> select * from top250 where title = 未麻的部屋;
ERROR 1054 (42S22): Unknown column '未麻的部屋' in 'where clause'
mysql> select * from top250 where top=175;
Empty set (0.00 sec)
mysql>
两个小问题：
1.没想到数据库字段不能用'-'...，于是page-code字段与origin-title字段不能独立进行查找。。。
2.不知道为啥top175的电影《未麻的部屋》没爬到。。。
建议使用scrapy。
用scrapy的一些好处是配置爬虫很方便，还有其内部自带的html解析器、对不完整的url的组建等十分便利。
最后，吐槽一下，之前的电脑配置太差，跑深度学习程序的过程耗尽内存，出现莫名的bug后，蓝屏死机就再也没法启动了。。。所以，暂时不能更新博客了。。。