import pygame
pygame.init()

white=(60,60,60)
black=(200,200,200)
green=(0,255,0)
red=(255,0,0)

size=[300,400]
escape=False
screen=pygame.display.set_mode(size)
pygame.display.set_caption("Калькулятор")
clock=pygame.time.Clock()

screen.fill(white)
#прорисовка кнопок
pygame.draw.line(screen,black,[0,80],[300,80],3)

pygame.draw.rect(screen,black,[0,80,75,80],3)
pygame.draw.rect(screen,black,[75,80,75,80],3)
pygame.draw.rect(screen,black,[150,80,75,80],3)
pygame.draw.rect(screen,black,[225,80,75,80],3)

pygame.draw.rect(screen,black,[0,160,75,80],3)
pygame.draw.rect(screen,black,[75,160,75,80],3)
pygame.draw.rect(screen,black,[150,160,75,80],3)
pygame.draw.rect(screen,black,[225,160,75,80],3)

pygame.draw.rect(screen,black,[0,240,75,80],3)
pygame.draw.rect(screen,black,[75,240,75,80],3)
pygame.draw.rect(screen,black,[150,240,75,80],3)
pygame.draw.rect(screen,black,[225,240,75,80],3)

pygame.draw.rect(screen,black,[0,320,75,80],3)
pygame.draw.rect(screen,black,[75,320,75,80],3)
pygame.draw.rect(screen,black,[150,320,75,80],3)
pygame.draw.rect(screen,black,[225,320,75,80],3)

pygame.draw.rect(screen,black,[0,400,75,80],3)
pygame.draw.rect(screen,black,[75,400,75,80],3)
pygame.draw.rect(screen,black,[150,400,75,80],3)
pygame.draw.rect(screen,black,[225,400,75,80],3)

while not escape:
    for event in pygame.event.get():
        if event.type==pygame.QUIT: #пока не нажмем выход
            escape=True

    pygame.display.flip()
    clock.tick(20)
pygame.quit() #закрытие окна