(编辑：jimmy 日期: 2025/10/26 浏览：2)
这篇文章主要介绍了爬虫代理池Python3WebSpider源代码测试过程解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
元类属性的使用
代码
主要关于元类的使用
通过获取由元类生成的爬虫抓取类的部分属性.这里为抓取函数,以相同的字符开头的抓取函数,生成属性列表,这样可以持续调用.目的是可以仅仅添加不同的抓取函数抓取不同的网站,而类的其他部分不用做调整.
部分代码:
class ProxyMetaclass(type):
def __new__(cls, name, bases, attrs):
count = 0
attrs['__CrawlFunc__'] = []
for k, v in attrs.items():
if 'crawl_' in k:
attrs['__CrawlFunc__'].append(k)
count += 1
attrs['__CrawlFuncCount__'] = count
return type.__new__(cls, name, bases, attrs)
class Crawler(object, metaclass=ProxyMetaclass):
def get_proxies(self, callback):
proxies = []
for proxy in eval("self.{}()".format(callback)):
print('成功获取到代理', proxy)
proxies.append(proxy)
return proxies
def crawl_daili66(self, page_count=4):
"""
获取代理66
:param page_count: 页码
:return: 代理
"""
start_url = 'http://www.66ip.cn/{}.html'
urls = [start_url.format(page) for page in range(1, page_count + 1)]
for url in urls:
print('Crawling', url)
html = get_page(url)
if html:
doc = pq(html)
trs = doc('.containerbox table tr:gt(0)').items()
for tr in trs:
ip = tr.find('td:nth-child(1)').text()
port = tr.find('td:nth-child(2)').text()
yield ':'.join([ip, port])
测试方法
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 12/19/19 4:10 PM
# @Author : yon
# @Email : @qq.com
# @File : test
import json
import re
from pyquery import PyQuery as pq
class ProxyMetaclass(type):
def __new__(cls, name, bases, attrs):
count = 0
attrs['__CrawlFunc__'] = []
for k, v in attrs.items():
print("打印k")
print(k)
print("打印v")
print(v)
if 'crawl_' in k:
attrs['__CrawlFunc__'].append(k)
count += 1
attrs['__CrawlFuncCount__'] = count
return type.__new__(cls, name, bases, attrs)
class Crawler(object, metaclass=ProxyMetaclass):
def get_proxies(self, callback):
proxies = []
for proxy in eval("self.{}()".format(callback)):
print('成功获取到代理', proxy)
proxies.append(proxy)
return proxies
def crawl_daili66(self, page_count=4):
"""
获取代理66
:param page_count: 页码
:return: 代理
"""
start_url = 'http://www.66ip.cn/{}.html'
urls = [start_url.format(page) for page in range(1, page_count + 1)]
for url in urls:
print('Crawling', url)
html = get_page(url)
if html:
doc = pq(html)
trs = doc('.containerbox table tr:gt(0)').items()
for tr in trs:
ip = tr.find('td:nth-child(1)').text()
port = tr.find('td:nth-child(2)').text()
yield ':'.join([ip, port])
def crawl_ip3366(self):
for page in range(1, 4):
start_url = 'http://www.ip3366.net/free/"IP">(.*"PORT">(.*"port.*?>(\d+)</li>', re.S)
re_ip_address = ip_address.findall(html)
for address, port in re_ip_address:
result = address + ':' + port
yield result.replace(' ', '')
class Getter():
def __init__(self):
self.crawler = Crawler()
def run(self):
print('获取器开始执行')
for callback_label in range(self.crawler.__CrawlFuncCount__):
print(callback_label)
callback = self.crawler.__CrawlFunc__[callback_label]
print(callback)
# # 获取代理
# proxies = self.crawler.get_proxies(callback)
# sys.stdout.flush()
# for proxy in proxies:
# self.redis.add(proxy)
if __name__ == '__main__':
get = Getter()
get.run()
测试结果
/home/baixiaoxu/PycharmProjects/pytthon-tt/venv/bin/python /home/baixiaoxu/PycharmProjects/pytthon-tt/proxypool/test.py 打印k __module__ 打印v __main__ 打印k __qualname__ 打印v Crawler 打印k get_proxies 打印v <function Crawler.get_proxies at 0x7f905ca5a598> 打印k crawl_daili66 打印v <function Crawler.crawl_daili66 at 0x7f905ca5a620> 打印k crawl_ip3366 打印v <function Crawler.crawl_ip3366 at 0x7f905ca5a840> 打印k crawl_kuaidaili 打印v <function Crawler.crawl_kuaidaili at 0x7f905ca5a730> 打印k crawl_xicidaili 打印v <function Crawler.crawl_xicidaili at 0x7f905ca5a7b8> 打印k crawl_iphai 打印v <function Crawler.crawl_iphai at 0x7f905ca5a6a8> 打印k crawl_data5u 打印v <function Crawler.crawl_data5u at 0x7f905ca5a8c8> 打印k __CrawlFunc__ 打印v ['crawl_daili66', 'crawl_ip3366', 'crawl_kuaidaili', 'crawl_xicidaili', 'crawl_iphai', 'crawl_data5u'] 获取器开始执行 0 crawl_daili66 1 crawl_ip3366 2 crawl_kuaidaili 3 crawl_xicidaili 4 crawl_iphai 5 crawl_data5u 进程完成，退出码 0
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。