human
Complete this python program:
def _scalar_property(fieldname):
assistant
#Here is the Python program you requested.

    """Create a property descriptor around the :class:`_PropertyMixin` helpers.
    """
    def _getter(self):
        'Scalar    property    getter.'
        return self._properties.get(fieldname)
    def _setter(self, value):
        'Scalar    property    setter.'
        self._patch_property(fieldname, value)
    return property(_getter, _setter)