[Python] I can't make sine wave visible [duplicate]

import pygame as pg
import sys as sy
import numpy as np

game = True

width = 900
height = 600
screen = pg.display.set_mode((width, height))
pg.display.set_caption("UCBG")
def main_menu():
while game:
screen.fill((0, 0, 0))
pg.font.init()
font = pg.font.SysFont("freemonospaced", 35)
font_surf = font.render("UCBG", True, (255, 255, 255))
screen.blit(font_surf, (width / 2 - 50, height / 2 - 100))
# sine wave
Ys = []
t = 0
r = 100
xs, ys = 0, 540
xs += (r * np.cos(t))
ys += (r * np.sin(t))
Ys.insert(0, ys)
if len(Ys) > width:
Ys.pop()
for i in range(len(Ys)):
pg.draw.circle(screen, (255,0,0),(i, Ys), 1, 1)

t += 0.01

pg.display.update()
for e in pg.event.get():
if e.type == pg.QUIT:
sy.exit()
main_menu()



I thought that text would be in front of the sine wave and sine would just be the background but only text shows up. I tried re-arranging the code block but that didn't work. I'm clueless and it's my first time do a project in pygame withput guides.

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