1cdef class Parrot: 2 cdef object name 3 cdef int alive 4 5cdef class Norwegian(Parrot): 6 cdef object plumage_colour 7 8def create(): 9 cdef Parrot p 10 p = Norwegian() 11 p.alive = 1 12 return p 13 14def rest(Norwegian polly): 15 """ 16 >>> p = create() 17 >>> rest(p) 18 0 19 """ 20 cdef Parrot fred 21 cdef object spam 22 spam = None 23 24 fred = polly 25 polly = fred 26 polly = spam 27 assert polly is None 28 assert fred.alive 29 30 spam = polly 31 fred.alive = 0 32 33 return fred.alive 34