vector angle calculation in python

#!/usr/bin/env python3

from dataclasses import dataclass
import math

def dbg(val):
    print(val)
    return val

def to_degrees(rad: float) -> float:
    return (rad / math.pi) * 180

def from_degrees(deg: float) -> float:
    return deg / 180 * math.pi

@dataclass
class Vec:
    x: float
    y: float
    z: float

    def add(self, other: 'Vec') -> 'Vec':
        return Vec(self.x + other.x, self.y + other.y, self.z + other.z)

    def sub(self, other: 'Vec') -> 'Vec':
        return Vec(self.x - other.x, self.y - other.y, self.z - other.z)

    def dot(self, other: 'Vec') -> float:
        return self.x * other.x + self.y * other.y + self.z * other.z

    def magnitude(self) -> float:
        return (self.x**2 + self.y**2 + self.z**2) ** (0.5)

    def cos(self, other: 'Vec') -> float:
        return max(min((self.dot(other)) / (self.magnitude() * other.magnitude()), 1.0), -1.0)

    def angle(self, other: 'Vec') -> float:
        return math.acos(dbg(self.cos(other)))

print('Vec(1,1,1).magnitude() == ', Vec(1,1,1).magnitude())
print('Vec(3,4,0).magnitude() == ', Vec(3,4,0).magnitude())
assert Vec(1,1,1).magnitude() > 1.0

assert Vec(1,1,1).angle(Vec(1,1,1)) == 0
assert Vec(0,1,0).angle(Vec(1,0,0)) == math.pi * 0.5, Vec(0,1,0).angle(Vec(1,0,0))

print("Vec(0,1,0).angle(Vec(1,0,0)) == ", to_degrees(Vec(0,1,0).angle(Vec(1,0,0))), "degrees")
assert from_degrees(to_degrees(math.pi)) == math.pi, from_degrees(to_degrees(math.pi))