Python动态加载脚本的方法

Python动态加载脚本的方法 Tue, 2006-10-10 13:10 — Marchday ################### ##                # ## classloader.py # ##                # ################### import sys, types def _get_mod(modulePath):     try:         aMod = sys.modules[modulePath]         if not isinstance(aMod, types.ModuleType):             raise KeyError     except KeyError:         # The last [''] is very important!         aMod = __import__(modulePath, globals(), locals(), [''])         sys.modules[modulePath] = aMod     return aMod def _get_func(fullFuncName):     """Retrieve a function object from a full dotted-package name."""         # Parse out the path, module, and function     lastDot = fullFuncName.rfind(u".")     funcName = fullFuncName[lastDot + 1:]     modPath = fullFuncName[:lastDot]         aMod = _get_mod(modPath)     aFunc = getattr(aMod, funcName)         # Assert that the function is a *callable* attribute.     assert callable(aFunc), u"%s is not callable." % fullFuncName         # Return a reference to the function itself,     # not the results of the function.     return aFunc def _get_class(fullClassName, parentClass=None):     """Load a module and retrieve a class (NOT an instance).         If the parentClass is supplied, className must be of parentClass     or a subclass of parentClass (or None is returned).     """     aClass = _get_func(fullClassName)         # Assert that the class is a subclass of parentClass.     if parentClass is not None:         if not issubclass(aClass, parentClass):             raise TypeError(u"%s is not a subclass of %s" %                             (fullClassName, parentClass))         # Return a reference to the class itself, not an instantiated object.     return aClass ###################### ##       Usage      ## ###################### class StorageManager: pass class StorageManagerMySQL(StorageManager): pass def storage_object(aFullClassName, allOptions={}):     aStoreClass = _get_class(aFullClassName, StorageManager)     return aStoreClass(allOptions) 注意 __import__(modulePath, globals(), locals(), [''])行，最后一个参数['']，必须为空。如果你要加载的模块在搜寻路径(sys.path)的某个子目录，比如pylibs，则这里是['pylibs']。 参考资料： http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/223972/index_txt     * Python     * Marchday's blog     * Add new comment