exceptionalong with an error messagethe exception may be caught in try or allowed to terminate the script here is the codealong with self test at the bottom of the file it will work under both python and ( and laterbecause it employs version-neutral print and raise syntaxthough as coded it catches built-insdispatch to operator overloading method attributes in only (more on this in moment)""file access py ( xprivacy for attributes fetched from class instances see self-test code at end of file for usage example decorator same asdoubler private('data''size')(doublerprivate returns ondecoratorondecorator returns oninstanceand each oninstance instance embeds doubler instance ""traceme false def trace(*args)if tracemeprint('[join(map(strargs)']'def private(*privates)privates in enclosing scope def ondecorator(aclass)aclass in enclosing scope class oninstancewrapped in instance attribute def __init__(self*args**kargs)self wrapped aclass(*args**kargsdef __getattr__(selfattr)my attrs don' call getattr trace('get:'attrothers assumed in wrapped if attr in privatesraise typeerror('private attribute fetchattrelsereturn getattr(self wrappedattrdef __setattr__(selfattrvalue)outside accesses trace('set:'attrvalueothers run normally if attr ='wrapped'allow my attrs self __dict__[attrvalue avoid looping elif attr in privatesraise typeerror('private attribute changeattrelsesetattr(self wrappedattrvaluewrapped obj attrs return oninstance or use __dict__ return ondecorator if __name__ ='__main__'traceme true @private('data''size'class doublerdoubler private)(doublerexample"privateand "publicattributes