docs/examples/userguide/language_basics/optional_subclassing.pyx


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from __future__ import print_function

cdef class A:
    cdef foo(self):
        print("A")

cdef class B(A):
    cdef foo(self, x=None):
        print("B", x)

cdef class C(B):
    cpdef foo(self, x=True, int k=3):
        print("C", x, k)