cython

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from sin_of_square cimport Function
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cdef class WaveFunction(Function):
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    # Not available in Python-space:
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    cdef double offset
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    # Available in Python-space:
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    cdef public double freq
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    # Available in Python-space, but only for reading:
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    cdef readonly double scale
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    # Available in Python-space:
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    @property
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    def period(self):
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        return 1.0 / self.freq
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    @period.setter
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    def period(self, value):
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        self.freq = 1.0 / value
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