1from __future__ import print_function 2 3 4cdef class A: 5 6 cdef foo(self): 7 print("A") 8 9 10cdef class B(A): 11 12 cpdef foo(self): 13 print("B") 14 15class C(B): # NOTE: not cdef class 16 def foo(self): 17 print("C") 18