<s> try : <EOL> import greenlet <EOL> getcurrent = greenlet . greenlet . getcurrent <EOL> GreenletExit = greenlet . greenlet . GreenletExit <EOL> greenlet = greenlet . greenlet <EOL> except ImportError , e : <EOL> raise <EOL> try : <EOL> from py . magic import greenlet <EOL> getcurrent = greenlet . getcurrent <EOL> GreenletExit = greenlet . GreenletExit <EOL> except ImportError : <EOL> try : <EOL> from stackless import greenlet <EOL> getcurrent = greenlet . getcurrent <EOL> GreenletExit = greenlet . GreenletExit <EOL> except ImportError : <EOL> try : <EOL> from support . stacklesss import greenlet , getcurrent , GreenletExit <EOL> ( greenlet , getcurrent , GreenletExit ) <EOL> except ImportError , e : <EOL> raise ImportError ( "<STR_LIT>" ) </s>
