BlogJava-Calvin's Tech Space-随笔分类-Pythonhttp://www.blogjava.net/lihao336/category/46782.html成于坚忍，毁于浮躁zh-cnThu, 19 May 2011 17:09:21 GMTThu, 19 May 2011 17:09:21 GMT60The Zen of Pythonhttp://www.blogjava.net/lihao336/archive/2011/05/18/350541.htmlcalvincalvinWed, 18 May 2011 14:58:00 GMThttp://www.blogjava.net/lihao336/archive/2011/05/18/350541.htmlhttp://www.blogjava.net/lihao336/comments/350541.htmlhttp://www.blogjava.net/lihao336/archive/2011/05/18/350541.html#Feedback0http://www.blogjava.net/lihao336/comments/commentRss/350541.htmlhttp://www.blogjava.net/lihao336/services/trackbacks/350541.htmlThe Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!

calvin 2011-05-18 22:58 发表评论
]]>模块http://www.blogjava.net/lihao336/archive/2010/10/29/336448.htmlcalvincalvinFri, 29 Oct 2010 02:21:00 GMThttp://www.blogjava.net/lihao336/archive/2010/10/29/336448.htmlhttp://www.blogjava.net/lihao336/comments/336448.htmlhttp://www.blogjava.net/lihao336/archive/2010/10/29/336448.html#Feedback0http://www.blogjava.net/lihao336/comments/commentRss/336448.htmlhttp://www.blogjava.net/lihao336/services/trackbacks/336448.html
1 #!/usr/bin/python
2 # Filename: using_name.py
3 
4 if __name__ == '__main__':
5     print 'This program is being run by itself'
6 else:
7     print 'I am being imported from another module'

$ python using_name.py
This program is being run by itself

$ python
>>> import using_name
I am being imported from another module
>>>

如果__name__是'__main__'，这说明这个模块被用户单独运行，这样，可以根据当前这个模块是否正在被别的模块引用，决定是否执行代码块。

2.使用dir()函数来列出模块的标示符
可以使用内建的dir函数来列出模块定义的标识符。标识符有函数、类和变量。
当你为dir()提供一个模块名的时候，它返回模块定义的名称列表。如果不提供参数，它返回当前模块中定义的名称列表。
同时，可以使用del函数来删除当前模块中的变量/属性。




calvin 2010-10-29 10:21 发表评论
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