docs/examples/userguide/extension_types/extendable_animal.pyx


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cdef class Animal:

    cdef int number_of_legs

    def __cinit__(self, int number_of_legs):
        self.number_of_legs = number_of_legs


class ExtendableAnimal(Animal):  # Note that we use class, not cdef class
    pass


dog = ExtendableAnimal(4)
dog.has_tail = True