Example of raw plotting 2d funciton with pygame

plot_example.py

import pygame


larg, alt = 800, 600
intervalo = -10, 10
fator_y = 1.0

tela = pygame.display.set_mode((larg, alt))

f_x= lambda x:3 * x ** 2 + 2 * x + 4

for x_tela in range(larg):
    x = (x_tela - (larg / 2) ) / larg * (intervalo[1] - intervalo[0]) + intervalo[0]
    y = f_x(x)

    y_tela = alt - int(y * fator_y)
    tela.set_at((x_tela, y_tela), (255, 255, 255))

pygame.display.flip()
input("pressione ENTER para encerrar")