#! /usr/bin/env python#coding=utf-8

import inspectimport sys

__author__ = 'Harry Liu, <harrychinese@gmail.com>'__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