'Import a module, raising an ImportError exception if the module
is considered unsafe.
This method is implicitly called by code executing in the
restricted environment.  Overriding this method in a subclass is
used to change the policies enforced by a restricted environment.'

def r_import(self, mname, globals={}, locals={}, fromlist=[]):

    return self.importer.import_module(mname, globals, locals, fromlist)
