cdef say_hello_by_cdef(name='World'):

return 'Hello, {}!'.format(name)

cpdef say_hello_by_cpdef(name='World'):

return 'Hello, {}!'.format(name)

def say_hello_by_def(name='World'):

return 'Hello, {}!'.format(name)

def call_say_hello_by_cdef(name='World'):

return say_hello_by_cdef(name)