Python的命名习惯

stackoverflow上神人总结的Python命名习惯：

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

references：

http://stackoverflow.com/questions/159720/what-is-the-naming-convention-in-python-for-variable-and-function-names