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Traceback (most recent call last):
  File "/home/ata/source/property-test.py", line 21, in <module>
    element.coordinates((7, 2, 9))
TypeError: 'tuple' object is not callable

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class Element:
    def __init__(self, x, y, z):
        self._x = x
        self._y = y
        self._z = z

    @property
    def coordinates(self):
        return self._x, self._y, self._z

    @coordinates.setter
    def coordinates(self, new_coordinate):
        self._x, self._y, self._z = new_coordinate

    def set_coordinates(self, new_coordinate):
        self._x, self._y, self._z = new_coordinate

element = Element(10, 5, 8)
element.set_coordinates((5, 3, 8))
print(element.coordinates)

element.coordinates((7, 2, 9))

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element.coordinates = (7, 2, 9)