Untitled

from pygame import *
font.init()
win = display.set_mode((600,600))
display.set_caption('Trash')
clock = time.Clock()
gravity = .5
y_speed = 0
jump_strength = -10
on_ground = True
player = Rect(250, 0, 50, 50)
platforms = [(0,600,600,1), (400, 500, 150, 10)]
run = True

while run:
    for e in event.get():
        if e.type == QUIT:
            run = False
    keys = key.get_pressed()
    if keys[K_d] and player.x < 550:
        player.x += 4
    if keys[K_a] and player.x > 0:
        player.x -= 4
    if keys[K_SPACE] and on_ground:
        y_speed = jump_strength
    player.y += y_speed
    y_speed += gravity
    if y_speed < 0:
        on_ground = False
    win.fill((30,160,220))
    draw.rect(win, (255, 255, 36), player)
    for platform in platforms:
        platform_rect = Rect(platform)
        draw.rect(win, (43, 255, 36), platform_rect)
        if player.colliderect(platform_rect) and y_speed > 0:
            player.bottom = platform_rect.top
            on_ground = True
            y_speed = 0
    display.update()
    clock.tick(30)