在 PyPy 上运行 Scrapy

是否可以运行Scrapy on PyPy？我浏览了文档和 github 项目，但唯一的地方PyPy提到的是有一些单元测试正在执行PyPy2年前，参见PyPy support https://github.com/scrapy/scrapy/pull/205。还有Scrapy 在 PyPy 中失败 https://mail.python.org/pipermail/pypy-dev/2012-December/010683.html三年前进行了长时间的讨论，但没有具体的解决方案或后续行动。

据我了解，Scrapy的主要依赖Twisted is 已知致力于PyPy https://bitbucket.org/pypy/compatibility/wiki/twisted。 Scrapy 还使用lxml用于 HTML 解析，其中有一个PyPy-友好的分叉 https://github.com/amauryfa/lxml/tree/cffi。另一个依赖项，pyOpenSSL https://travis-ci.org/pyca/pyopenssl/jobs/66236395完全支持（感谢@Glyph 的评论）。

是的。 :-)

更详细地说，我已经在我的盒子上安装了 pypy 2.6.0 版本（带 pip）。简单地运行pip install scrapy nearly刚刚为我工作。原来我需要一些额外的库 http://lxml.de/installation.html对于lxml。之后就好了。

安装后，我可以运行dmoz教程 http://doc.scrapy.org/en/latest/intro/tutorial.html。例如：

[user@localhost scrapy_proj]# scrapy crawl dmoz
2015-06-30 14:34:45 [scrapy] INFO: Scrapy 1.0.0 started (bot: scrapy_proj)
2015-06-30 14:34:45 [scrapy] INFO: Optional features available: ssl, http11
2015-06-30 14:34:45 [scrapy] INFO: Overridden settings: {'BOT_NAME': 'scrapy_proj', 'NEWSPIDER_MODULE': 'scrapy_proj.spiders', 'SPIDER_MODULES': ['scrapy_proj.spiders']}
2015-06-30 14:34:45 [py.warnings] WARNING: :0: UserWarning: You do not have a working installation of the service_identity module: 'No module named service_identity'.  Please install it from <https://pypi.python.org/pypi/service_identity> and make sure all of its dependencies are satisfied.  Without the service_identity module and a recent enough pyOpenSSL to support it, Twisted can perform only rudimentary TLS client hostname verification.  Many valid certificate/hostname mappings may be rejected.

2015-06-30 14:34:45 [scrapy] INFO: Enabled extensions: CoreStats, TelnetConsole, CloseSpider, LogStats, SpiderState
2015-06-30 14:34:45 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-06-30 14:34:45 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2015-06-30 14:34:45 [scrapy] INFO: Enabled item pipelines: 
2015-06-30 14:34:45 [scrapy] INFO: Spider opened
2015-06-30 14:34:45 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2015-06-30 14:34:45 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2015-06-30 14:34:46 [scrapy] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/> (referer: None)
2015-06-30 14:34:46 [scrapy] DEBUG: Crawled (200) <GET http://www.dmoz.org/Computers/Programming/Languages/Python/Books/> (referer: None)
2015-06-30 14:34:46 [scrapy] INFO: Closing spider (finished)
2015-06-30 14:34:46 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 514,
 'downloader/request_count': 2,
 'downloader/request_method_count/GET': 2,
 'downloader/response_bytes': 16286,
 'downloader/response_count': 2,
 'downloader/response_status_count/200': 2,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2015, 6, 30, 13, 34, 46, 219002),
 'log_count/DEBUG': 3,
 'log_count/INFO': 7,
 'log_count/WARNING': 1,
 'response_received_count': 2,
 'scheduler/dequeued': 2,
 'scheduler/dequeued/memory': 2,
 'scheduler/enqueued': 2,
 'scheduler/enqueued/memory': 2,
 'start_time': datetime.datetime(2015, 6, 30, 13, 34, 45, 652421)}
2015-06-30 14:34:46 [scrapy] INFO: Spider closed (finished)

根据要求，以下是有关我正在运行的版本的更多信息：

[user@localhost scrapy_proj]# which scrapy
/opt/pypy/bin/scrapy
[user@localhost scrapy_proj]# scrapy version
2015-06-30 15:04:42 [scrapy] INFO: Scrapy 1.0.0 started (bot: scrapy_proj)
2015-06-30 15:04:42 [scrapy] INFO: Optional features available: ssl, http11
2015-06-30 15:04:42 [scrapy] INFO: Overridden settings: {'BOT_NAME': 'scrapy_proj', 'NEWSPIDER_MODULE': 'scrapy_proj.spiders', 'SPIDER_MODULES': ['scrapy_proj.spiders']}
Scrapy 1.0.0