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url_manager.py
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34 lines (26 loc) · 911 Bytes
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#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
__author__ = 'Gary'
# 爬虫url管理器
class UrlManager(object):
def __init__(self):
self.new_urls = set()
self.old_urls = set()
def add_new_url(self, url):
if url is None:
return
# 如果这个url既不在新的url列表钟又不在旧的url列表中，说明这是一个新的url地址
if url not in self.new_urls and url not in self.old_urls:
self.new_urls.add(url)
def add_new_urls(self, urls):
if urls is None or len(urls) == 0 :
return
for url in urls:
self.add_new_url(url)
def has_new_url(self):
# 如果新的url长度不等于0，就说明有的地址
return len('self.new_urls') != 0
def get_new_url(self):
new_url = self.new_urls.pop()
self.old_urls.add(new_url)
return new_url