import?urllib.request


class?HtmlDownloader（object）:
????def?download（self?url）:
????????if?url?is?None:
????????????return?None
????????response?=?urllib.request.urlopen（url）
????????if?response.getcode（）?!=?200:
????????????return?None

????????return?response.read（）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-06-21?19:30??python百度百科爬蟲\
?????文件???????????5??2016-08-16?14:10??python百度百科爬蟲\.gitignore
?????目錄???????????0??2017-06-21?19:30??python百度百科爬蟲\.idea\
?????文件?????????257??2017-03-03?16:44??python百度百科爬蟲\.idea\misc.xml
?????文件?????????304??2017-03-03?16:44??python百度百科爬蟲\.idea\modules.xml
?????文件?????????398??2017-03-03?16:44??python百度百科爬蟲\.idea\python_baike_spider-master.iml
?????文件?????????180??2016-08-16?14:10??python百度百科爬蟲\.idea\vcs.xml
?????文件???????42640??2017-04-05?14:33??python百度百科爬蟲\.idea\workspace.xml
?????文件?????????271??2016-08-16?14:10??python百度百科爬蟲\README.md
?????目錄???????????0??2017-06-21?19:30??python百度百科爬蟲\baike_spider\
?????文件???????????0??2016-08-16?14:10??python百度百科爬蟲\baike_spider\__init__.py
?????目錄???????????0??2017-06-21?19:30??python百度百科爬蟲\baike_spider\__pycache__\
?????文件?????????159??2017-03-03?16:42??python百度百科爬蟲\baike_spider\__pycache__\__init__.cpython-36.pyc
?????文件?????????596??2017-03-03?16:42??python百度百科爬蟲\baike_spider\__pycache__\html_downloader.cpython-36.pyc
?????文件????????1207??2017-03-03?16:42??python百度百科爬蟲\baike_spider\__pycache__\html_outputer.cpython-36.pyc
?????文件????????1390??2017-03-03?16:42??python百度百科爬蟲\baike_spider\__pycache__\html_parser.cpython-36.pyc
?????文件????????1188??2017-03-03?16:42??python百度百科爬蟲\baike_spider\__pycache__\url_manager.cpython-36.pyc
?????文件?????????272??2016-08-16?14:10??python百度百科爬蟲\baike_spider\html_downloader.py
?????文件?????????839??2016-08-16?14:10??python百度百科爬蟲\baike_spider\html_outputer.py
?????文件????????1175??2016-08-16?14:10??python百度百科爬蟲\baike_spider\html_parser.py
?????文件???????57442??2017-03-03?17:18??python百度百科爬蟲\baike_spider\output.html
?????文件????????1231??2017-03-03?17:09??python百度百科爬蟲\baike_spider\spider_main.py
?????文件?????????634??2016-08-16?14:10??python百度百科爬蟲\baike_spider\url_manager.py
?????目錄???????????0??2017-06-21?19:30??python百度百科爬蟲\dict_spider\
?????目錄???????????0??2017-06-21?19:30??python百度百科爬蟲\dict_spider\__pycache__\
?????文件????????2101??2017-04-04?19:56??python百度百科爬蟲\dict_spider\__pycache__\html_downloader.cpython-36.pyc
?????文件????????2559??2017-04-04?19:56??python百度百科爬蟲\dict_spider\__pycache__\html_parser.cpython-36.pyc
?????文件????????2251??2016-08-16?14:10??python百度百科爬蟲\dict_spider\html_downloader.py
?????文件????????4746??2016-08-16?14:10??python百度百科爬蟲\dict_spider\html_parser.py
?????目錄???????????0??2017-06-21?19:30??python百度百科爬蟲\dict_spider\img\
?????文件????????5515??2016-08-16?14:10??python百度百科爬蟲\dict_spider\img\1471327793.jpg
............此處省略15個文件信息