这篇文章来自著名的《向你学习哈斯克尔》一书的第三章。下面的代码解释了我的问题和困惑:head' :: [a] -> ahead' (x:_) = x
-- It is my understanding that [3] is the same as 3:[]. Why do they don't work the sa
我在64位windows 7上运行python2.7.2版本64位。我遵循了教程,并在我的机器上安装了scrapy。然后我创建了一个项目,demoz。\lib\runpy.py", line 162, in _run_module_as_mainFile "C:\Python27\lib\runpy.py", line 72, in _run_codeFile &q
24 18:12:56-0400 [scrapy] DEBUG: Enabled item pipelines:File "c:\Python27\Scripts\scrapy", line 4, in <module>File "c:\Python27\lib\site-packages\scrapy-0.14.0.2841scrapy\cmdline.py", line 132, in execute
_run