文本不会进入屏幕

Question

I am trying to blit the score in the left corner of the screen. I have currently been trying for 2 hours and nothing seems to be working.

font = pygame.font.SysFont("arial", 72)     
text = "Score:" + str(enemies_clicked)
label = font.render(text, 1, red)
screen.blit(label, (20, 10))

There are no error messages. I tried different fonts and everything seems to work, except the text. The font variable is declared between the pygame.init() and the while loop. The other 3 lines are 2 indents deep in the while loop.

Complete code:

import pygame
import sys
import time
from random import randint as random

pygame.init()

width = 600
height = 400

block_size = 40

enemy_size = block_size
enemy_pos = [int(random(1,14)*block_size), int(random(1,8)*block_size)]
enemies_clicked = 0

font = pygame.font.SysFont("comicsansms", 72)

black = (0,0,0)
white = (255,255,255)
red = (255,0,0)
blue = (0,0,255)
green = (0,255,0)

screen = pygame.display.set_mode((width, height))
pygame.display.set_caption("click game")

def clicked_on_enemy(enemy_pos, enemy_size, click_pos):

    e_x = enemy_pos[0]
    e_y = enemy_pos[1]
    c_e = click_pos[0]
    c_y = click_pos[1]

    x_col = False
    y_col = False

    for i in range(enemy_size):
        if e_x + i == c_e:
            x_col = True

    for i in range(enemy_size):
        if e_y + i == c_y:
            y_col = True

    if x_col and y_col:
        return True
    else:
        return False

#main loop#
while True:

    for event in pygame.event.get():

        if event.type == pygame.QUIT:
            sys.exit()

        if event.type == pygame.MOUSEBUTTONUP:
            click_pos = pygame.mouse.get_pos()

            if clicked_on_enemy(enemy_pos, enemy_size, click_pos):
                enemy_pos = [int(random(1,14) * block_size), int(random(1,8) * block_size)]
                enemies_clicked += 1

        text = "Score:" + str(enemies_clicked)  
        label = font.render(text, 1, red)
        screen.blit(label, (20, 10))

    screen.fill(black)
    pygame.draw.rect(screen, green, (enemy_pos[0],enemy_pos[1], enemy_size, enemy_size))
    pygame.display.update()

Answer 1

You blit it in wrong place - you have to do it after screen.fill(black) which clears buffer. And before pygame.display.update() which sends buffer on screen.

if you blit before screen.fill(black) then fill() removes it and you can't see it on screen.

text = "Score:" + str(enemies_clicked)  
label = font.render(text, 1, red)

screen.fill(black)

pygame.draw.rect(screen, green, (enemy_pos[0],enemy_pos[1], enemy_size, enemy_size))

screen.blit(label, (20, 10))

pygame.display.update()