import re from urllib.request import urlopen def getPage(url): response = urlopen(url) return response.read().decode('utf-8') def parsePage(s): ret = re.findall( '<div class="item">.*?<div class="pic">.*?<em .*?>(?P<id>d+).*?<span class="title">(?P<title>.*?)</span>' '.*?<span class="rating_num" .*?>(?P<rating_num>.*?)</span>.*?<span>(?P<comment_num>.*?)评价</span>',s,re.S) return ret def main(num): url = 'https://movie.douban.com/top250?start=%s&filter=' % num response_html = getPage(url) ret = parsePage(response_html) print(ret) count = 0 for i in range(10): # 10页 main(count) count += 25 # url从网页上把代码搞下来 # bytes decode ——> utf-8 网页内容就是我的待匹配字符串 # ret = re.findall(正则,带匹配的字符串) #ret是所有匹配到的内容组成的列表
import requests import re import json def getPage(url): response = requests.get(url) return response.text def parsePage(s): com = re.compile( '<div class="item">.*?<div class="pic">.*?<em .*?>(?P<id>d+).*?<span class="title">(?P<title>.*?)</span>' '.*?<span class="rating_num" .*?>(?P<rating_num>.*?)</span>.*?<span>(?P<comment_num>.*?)评价</span>', re.S) ret = com.finditer(s) for i in ret: yield { "id": i.group("id"), "title": i.group("title"), "rating_num": i.group("rating_num"), "comment_num": i.group("comment_num"), } def main(num): url = 'https://movie.douban.com/top250?start=%s&filter=' % num response_html = getPage(url) ret = parsePage(response_html) print(ret) f = open("move_info7", "a", encoding="utf8") for obj in ret: print(obj) data = json.dumps(obj, ensure_ascii=False) f.write(data + " ") if __name__ == '__main__': count = 0 for i in range(10): main(count) count += 25
import re from urllib.request import urlopen def getPage(url): response = urlopen(url) return response.read().decode('utf-8') def parsePage(s): ret = re.findall( '<div class="item">.*?<div class="pic">.*?<em .*?>(?P<id>d+).*?<span class="title">(?P<title>.*?)</span>' '.*?<span class="rating_num" .*?>(?P<rating_num>.*?)</span>.*?<span>(?P<comment_num>.*?)评价</span>',s,re.S) return ret def main(num): url = 'https://movie.douban.com/top250?start=%s&filter=' % num response_html = getPage(url) ret = parsePage(response_html) #print(ret) f = open("move_info", "a", encoding="utf8") for obj in ret: print(obj) data = str(obj) f.write(data +" ") f.close() count = 0 for i in range(10): # 10页 main(count) count += 25
flags有很多可选值: re.I(IGNORECASE)忽略大小写,括号内是完整的写法 re.M(MULTILINE)多行模式,改变^和$的行为 re.S(DOTALL)点可以匹配任意字符,包括换行符 re.L(LOCALE)做本地化识别的匹配,表示特殊字符集 w, W, , B, s, S 依赖于当前环境,不推荐使用 re.U(UNICODE) 使用w W s S d D使用取决于unicode定义的字符属性。在python3中默认使用该flag re.X(VERBOSE)冗长模式,该模式下pattern字符串可以是多行的,忽略空白字符,并可以添加注释 flags