hello crawler

whoze · May 30, 2018 · 79f297a · 79f297a
1 parent b872556
commit 79f297a
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/Day66-75/code/example06.py b/Day66-75/code/example06.py
@@ -17,20 +17,22 @@ def main():
     seed_url = urljoin(base_url, 'explore')
     # 创建Redis客户端
     client = Redis(host='1.2.3.4', port=6379, password='1qaz2wsx')
-    # 设置用户代理
+    # 设置用户代理(否则访问会被拒绝)
     headers = {'user-agent': 'Baiduspider'}
     # 通过requests模块发送GET请求并指定用户代理
     resp = requests.get(seed_url, headers=headers)
     # 创建BeautifulSoup对象并指定使用lxml作为解析器
     soup = BeautifulSoup(resp.text, 'lxml')
     href_regex = re.compile(r'^/question')
+    # 将URL处理成SHA1摘要(长度固定更简短)
+    hasher_proto = sha1()
     # 查找所有href属性以/question打头的a标签
     for a_tag in soup.find_all('a', {'href': href_regex}):
         # 获取a标签的href属性值并组装完整的URL
         href = a_tag.attrs['href']
         full_url = urljoin(base_url, href)
-        # 将URL处理成SHA1摘要(长度固定更简短)
-        hasher = sha1()
+        # 传入URL生成SHA1摘要
+        hasher = hasher_proto.copy()
         hasher.update(full_url.encode('utf-8'))
         field_key = hasher.hexdigest()
         # 如果Redis的键'zhihu'对应的hash数据类型中没有URL的摘要就访问页面并缓存