Python imp 模块，load_package() 实例源码

def _load_plugins(self, plugin_dir, namespace):
        """
            Load all modules in plugin_dir
        """
        if not os.path.exists(os.path.join(plugin_dir, "__init__.py")):
            raise Exception("The plugin directory %s should be a valid python package with a __init__.py file" % plugin_dir)

        mod_name = ".".join(namespace.to_path())
        imp.load_package(mod_name, plugin_dir)

        for py_file in glob.glob(os.path.join(plugin_dir, "*.py")):
            if not py_file.endswith("__init__.py"):
                # name of the python module
                sub_mod = mod_name + "." + os.path.basename(py_file).split(".")[0]

                # create a namespace for the submodule
                new_ns = Namespace(sub_mod.split(".")[-1])
                new_ns.parent = namespace
                self.graph.add_namespace(new_ns, namespace)

                # load the python file
                imp.load_source(sub_mod, py_file)

def load_plugins(self):
        """
            Load all plug-ins from a configuration module
        """
        plugin_dir = os.path.join(self._path, "plugins")

        if not os.path.exists(plugin_dir):
            return

        if not os.path.exists(os.path.join(plugin_dir, "__init__.py")):
            raise CompilerException(
                "The plugin directory %s should be a valid python package with a __init__.py file" % plugin_dir)

        try:
            mod_name = self._meta["name"]
            imp.load_package("inmanta_plugins." + mod_name, plugin_dir)

            self._plugin_namespaces.append(mod_name)

            for py_file in glob.glob(os.path.join(plugin_dir, "*.py")):
                if not py_file.endswith("__init__.py"):
                    # name of the python module
                    sub_mod = "inmanta_plugins." + mod_name + "." + os.path.basename(py_file).split(".")[0]
                    self._plugin_namespaces.append(sub_mod)

                    # load the python file
                    imp.load_source(sub_mod, py_file)

        except ImportError as e:
            raise CompilerException("Unable to load all plug-ins for module %s" % self._meta["name"]) from e