Pygame showing only a black screen

Question

I am new to Pygame, so I was doing some testing before starting an actual game but when I executed the code, all I am getting is a black screen even though I have specified a color and I also tried using the blit method but is still showing only a black screen. Here is my code and the output on Ubuntu 20.04 and Python 3.8:

import pygame

pygame.init()

s = pygame.display.set_mode((1000,500))

testImg = pygame.image.load('player.png')
testX = 500
testY = 250

def test(x, y):
    s.blit(testImg, (x,y))

# Game Loop:
running = True
while running:
    s.fill((113,113,113))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    test(testX, testY)

Here is the output:

Answer 1

You missed to update the display by pygame.display.flip() at the end of the application loop:

running = True
while running:
    s.fill((113,113,113))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    test(testX, testY)

    pygame.display.flip() # <---

A minimal pygame application loop has to:

• handle the events by either pygame.event.pump() or pygame.event.get().
• update the game states and positions of objects dependent on the input events and time (respectively frames)
• clear the entire display or draw the background
• draw the entire scene (blit all the objects)
• update the display by either pygame.display.update() or pygame.display.flip()