chapter_20

代码说明：

说明：  聚焦爬虫的工作流程较为复杂，需要根据一定的网页分析算法过滤与主题无关的链接，保留有用的链接并将其放入等待抓取的URL队列。(The workflow of focusing on crawlers is more complicated, and it is necessary to filter the links irrelevant to the topic according to certain webpage analysis algorithms, retain useful links and put them into the queue of URLs waiting to be crawled.)

文件列表：

chapter_20, 0 , 2016-06-24
chapter_20\.gitignore, 31 , 2016-06-15
chapter_20\learning_log, 0 , 2016-06-24
chapter_20\learning_logs, 0 , 2016-06-24
chapter_20\learning_logs\admin.py, 135 , 2016-06-15
chapter_20\learning_logs\forms.py, 380 , 2016-06-15
chapter_20\learning_logs\migrations, 0 , 2016-06-24
chapter_20\learning_logs\migrations\0001_initial.py, 554 , 2016-06-15
chapter_20\learning_logs\migrations\0002_entry.py, 742 , 2016-06-15
chapter_20\learning_logs\migrations\0003_topic_owner.py, 553 , 2016-06-15
chapter_20\learning_logs\migrations\__init__.py, 0 , 2016-06-15
chapter_20\learning_logs\models.py, 779 , 2016-06-15
chapter_20\learning_logs\templates, 0 , 2016-06-24
chapter_20\learning_logs\templates\learning_logs, 0 , 2016-06-24
chapter_20\learning_logs\templates\learning_logs\base.html, 1763 , 2016-06-15
chapter_20\learning_logs\templates\learning_logs\edit_entry.html, 370 , 2016-06-15
chapter_20\learning_logs\templates\learning_logs\index.html, 468 , 2016-06-15
chapter_20\learning_logs\templates\learning_logs\new_entry.html, 370 , 2016-06-15
chapter_20\learning_logs\templates\learning_logs\new_topic.html, 461 , 2016-06-15
chapter_20\learning_logs\templates\learning_logs\topic.html, 748 , 2016-06-15
chapter_20\learning_logs\templates\learning_logs\topics.html, 464 , 2016-06-15
chapter_20\learning_logs\tests.py, 60 , 2016-06-15
chapter_20\learning_logs\urls.py, 719 , 2016-06-15
chapter_20\learning_logs\views.py, 3273 , 2016-06-15
chapter_20\learning_logs\__init__.py, 0 , 2016-06-15
chapter_20\learning_log\settings.py, 3545 , 2016-06-15
chapter_20\learning_log\static, 0 , 2016-06-24
chapter_20\learning_log\static\placeholder.txt, 148 , 2016-06-15
chapter_20\learning_log\templates, 0 , 2016-06-24
chapter_20\learning_log\templates\404.html, 142 , 2016-06-15
chapter_20\learning_log\templates\500.html, 135 , 2016-06-15
chapter_20\learning_log\urls.py, 277 , 2016-06-15
chapter_20\learning_log\wsgi.py, 435 , 2016-06-15
chapter_20\learning_log\__init__.py, 0 , 2016-06-15
chapter_20\manage.py, 255 , 2016-06-15
chapter_20\Procfile, 45 , 2016-06-15
chapter_20\README.md, 1684 , 2016-06-15
chapter_20\requirements.txt, 127 , 2016-06-15
chapter_20\runtime.txt, 13 , 2016-06-15
chapter_20\users, 0 , 2016-06-24
chapter_20\users\admin.py, 63 , 2016-06-15
chapter_20\users\migrations, 0 , 2016-06-24
chapter_20\users\migrations\__init__.py, 0 , 2016-06-15
chapter_20\users\models.py, 57 , 2016-06-15
chapter_20\users\templates, 0 , 2016-06-24
chapter_20\users\templates\users, 0 , 2016-06-24
chapter_20\users\templates\users\login.html, 509 , 2016-06-15
chapter_20\users\templates\users\register.html, 339 , 2016-06-15
chapter_20\users\tests.py, 60 , 2016-06-15
chapter_20\users\urls.py, 438 , 2016-06-15
chapter_20\users\views.py, 1112 , 2016-06-15
chapter_20\users\__init__.py, 0 , 2016-06-15