Error compiling Cython file:
------------------------------------------------------------
...
    def dist(self, other):
        return sqrt((self.x - other.x) ** 2 +
                    (self.y - other.y) ** 2 +
                    (self.z - other.z) ** 2)

    @cython.locals(self="GVector", other="GVector")
                       ^
------------------------------------------------------------

chaos.py:36:24: Not a type