from random import randint, random
from dataclasses import dataclass

N_Vehicles = 100000

def rndx():
    return 1000 * random()

def rndw():
    return 1000 + randint(-100, 100)

@dataclass
class Veh:
    "Vehicle class"
    x: float = 0.0
    speed: float = 0.0
    accel: float = 0.1
    mass: int = 1000


def main():
    step = 0.1
    vehs = [Veh(0.0, 0.0, 0.1, rndw()) for i in range(N_Vehicles)]
    assert vehs[0] != vehs[1]
    for i in range(1000):
        for v in vehs:
            v.x = v.x + v.speed * step
            v.speed = v.speed + v.accel * step
    print("[0].x = {}".format(vehs[0].x))