Angle calculation

angle.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

class Angle:

    val = 0
    
    def __init__(self, x, y, z):
        self.val = ((x * 60) + y) * 60 + z
        self.x = x
        self.y = y
        self.z = z

    def __lt__(self, other):
        return self.val < otehr.val

    def __le__(self, other):
        return self.val <= other.val

    def __eq__(self, other):
        return self.val == other.val

    def __ne__(self, other):
        return self.val != other.val

    def __gt__(self, other):
        return self.val > other.val

    def __ge__(self, other):
        return self.val >= other.val

    def __bool__(self):
        return self.val

    def __str__(self):
        return '{}°{}′{}″'.format(self.x, self.y, self.z)

    def __neg__(self):
        self.val = -self.val
        self.x = -self.x
        return self

    def __pos__(self):
        return self

    def __abs__(self):
        if self.val < 0:
            self.val = -self.val
            self.x = -self.x
        return self

    def __add__(self, other):
        val = self.val + other.val
        return Angle(0, 0, val).__onchange__()

    def __sub__(self, other):
        val = self.val - other.val
        return Angle(0, 0, val).__onchange__()

    def __iadd__(self, other):
        self.val += other.val
        return __onchange__(self)

    def __isub__(self, other):
        self.val -= other.val
        return __onchange__(self)

    def __onchange__(self):
        self.x, self.y = divmod(self.val // 60, 60)
        self.z = self.val % 60
        return self