Python编程风格，命名

需要规范一下代码了，参考google的Python风格指导：

http://google-styleguide.googlecode.com/svn/trunk/pyguide.html

文档中还包含了除了命名规范以外的其它东西，为方便阅读，直接把命名规范贴出：

http://google-styleguide.googlecode.com/svn/trunk/pyguide.html?showone=Naming#Naming

Naming

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module_name, package_name, ClassName, method_name, ExceptionName, function_name, GLOBAL_CONSTANT_NAME, global_var_name, instance_var_name, function_parameter_name, local_var_name.

Names to Avoid

single character names except for counters or iterators

dashes (-) in any package/module name

__double_leading_and_trailing_underscore__ names (reserved by Python)

Naming Convention

"Internal" means internal to a module or protected or private within a class.

Prepending a single underscore (_) has some support for protecting module variables and functions (not included with import * from). Prepending a double underscore (__) to an instance variable or method effectively serves to make the variable or method private to its class (using name mangling).

Place related classes and top-level functions together in a module. Unlike Java, there is no need to limit yourself to one class per module.

Use CapWords for class names, but lower_with_under.py for module names. Although there are many existing modules named CapWords.py, this is now discouraged because it's confusing when the module happens to be named after a class. ("wait -- did I write import StringIO or from StringIO import StringIO?")

Guidelines derived from Guido's Recommendations

Type	Public	Internal
Packages	lower_with_under
Modules	lower_with_under	_lower_with_under
Classes	CapWords	_CapWords
Exceptions	CapWords
Functions	lower_with_under()	_lower_with_under()
Global/Class Constants	CAPS_WITH_UNDER	_CAPS_WITH_UNDER
Global/Class Variables	lower_with_under	_lower_with_under
Instance Variables	lower_with_under	_lower_with_under (protected) or __lower_with_under (private)
Method Names	lower_with_under()	_lower_with_under() (protected) or __lower_with_under() (private)
Function/Method Parameters	lower_with_under
Local Variables	lower_with_under