scroll.py

from scrollkit import *

offset = 0

def c(x, y):
    factor = WIDTH/2 + (WIDTH/2 * sin(get_time()%50))
    v = sin(x / factor) +  sin(y / factor)
   
    h = 180 + (180 * v)
    h = (h+offset)%360
    color = hls_to_rgb(h, 0.5, 0.8)
    return color

try:
    for lineno in looper:
        for x in range(WIDTH):
            new_x = (x+lineno) % WIDTH
            color = c(x, lineno)
            r, g, b = [int(p * 255) for p in color]
            print(f'{fg(r, g, b)}\u2588', end='') 
            offset += 20
        print()
        
        sleep(0.02)
except KeyboardInterrupt:
    reset()
    print("bye!")

scrollkit.py

from math import sin, cos, acos, tan, pi, e 
from colorsys import hls_to_rgb
import shutil
from time import sleep, process_time as get_time
WIDTH = shutil.get_terminal_size().columns

class Looper:
    def __init__(self):
        self.n = 0
        self.end_message = ""    

    def __iter__(self):
        while True:
            yield self.n
            self.n += 1

def fg(r, g, b):
    return f'\033[38;2;{r};{g};{b}m'

def bg(r, g, b):
    return f'\033[48;2;{r};{g};{b}m'

def reset():
    print('\033[0m')

looper = Looper()