list_letters.py

import pygame
letters = [pygame.K_a, pygame.K_b, pygame.K_c, pygame.K_d, pygame.K_e, pygame.K_f,
           pygame.K_g, pygame.K_h, pygame.K_i, pygame.K_j, pygame.K_k, pygame.K_l,
           pygame.K_m, pygame.K_n, pygame.K_o, pygame.K_p, pygame.K_q, pygame.K_r,
           pygame.K_s, pygame.K_t, pygame.K_u, pygame.K_v, pygame.K_w, pygame.K_x,
           pygame.K_y, pygame.K_z]