def get_available_package(self, codepath, prefix=None):
        try:
            pkg = self._available_packages[codepath]
        except __HOLE__:
            pkg = self._registry.create_package(codepath, prefix=prefix)
            self._available_packages[codepath] = pkg
        pkg.persistent_configuration = \
                                self._startup.get_pkg_configuration(codepath)
        return pkg
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/packagemanager.py/PackageManager.get_available_package