之前写一个Python 版本的DbRowFactory(),   在初始化DbRowFactory时候, 除了要传cursor外, 还需要传一个RowClass类, 还有一个RowClass类的模块名, 用起来不爽, 改造了一下. 这个事情的一个副产品Python 版 Intance Activator, 代码如下:   

最新的代码和DbRowFactory都放在codeplex上了.

#! /usr/bin/env python #coding=utf-8 import inspect import sys __author__ = 'Harry Liu, 
     
      ' __date__ = '16 Feb 2012' __version__="0001" ##reference doc #http://www.cnblogs.com/sevenyuan/archive/2010/12/06/1898056.html #http://stackoverflow.com/questions/4513192/python-dynamic-class-names #http://stackoverflow.com/questions/1796180/python-get-list-of-al-classes-within-current-module def createIntance(full_class_name,*args,**kwargs): '''     instantiate class dynamically     [arguments]     full_class_name: full class name that you want to instantiate, included package and module name if has     *args: list style arguments in class constructor     *kwargs: dict style arguments in class constructor     [return]     an instance of this full_class_name     [example]     import pyObjectCreator     full_class_name="knightmade.logging.Logger"     logger=pyObjectCreator.create_intance(full_class_name,'logname') '''     class_meta=getClassMeta(full_class_name) if class_meta!=None:         obj=class_meta(*args,**kwargs) else:         obj=None return obj def getClassMeta(full_class_name):   '''     get class meta object of full_class_name, then we can use this meta object to instantiate full_class_name     [arguments]     full_class_name: full class name that you want to instantiate, included package and module name if has     [return]     an instance of this full_class_name     [example]     import pyObjectCreator     full_class_name="knightmade.logging.Logger"     loggerMeta=pyObjectCreator.getClassMeta(full_class_name) '''     namespace=full_class_name.strip().rsplit('.',1) if len(namespace)==1:         class_name=namespace[0]         class_meta=_getClassMetFromCurrModule(class_name) else:         module_name=namespace[0]         class_name=namespace[1]         class_meta=_getClassMetaFromOtherModule(class_name,module_name) return class_meta def _getClassMetFromCurrModule(class_name):     result=None     module_name="__main__" for name, obj in inspect.getmembers(sys.modules[module_name]): if inspect.isclass(obj): if name==class_name:                 result=obj break return result def _getClassMetaFromOtherModule(class_name, module_name):     module_meta=__import__(module_name,globals(), locals(),[class_name]) if module_meta!=None:         class_meta=getattr(module_meta,class_name) else:         class_meta=None return class_meta