Simple Multiplayer Python Game and Server

game.py

import pygame, sys
from pygame.locals import *
import pickle
import select
import socket

WIDTH = 400
HEIGHT = 400
BUFFERSIZE = 2048

screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption('Game')

clock = pygame.time.Clock()

sprite1 = pygame.image.load('images/BlueThing/BlueThing_front.png')
sprite2 = pygame.image.load('images/Ladette/Ladette_front.png')
sprite3 = pygame.image.load('images/TrashPanda/TrashPanda_front.png')
sprite4 = pygame.image.load('images/Tubby/Tubby_front.png')

serverAddr = '127.0.0.1'
if len(sys.argv) == 2:
  serverAddr = sys.argv[1]
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((serverAddr, 4321))

playerid = 0

sprites = { 0: sprite1, 1: sprite2, 2: sprite3, 3: sprite4 }

class Minion:
  def __init__(self, x, y, id):
    self.x = x
    self.y = y
    self.vx = 0
    self.vy = 0
    self.id = id

  def update(self):
    self.x += self.vx
    self.y += self.vy

    if self.x > WIDTH - 50:
      self.x = WIDTH - 50
    if self.x < 0:
      self.x = 0
    if self.y > HEIGHT - 50:
      self.y = HEIGHT - 50
    if self.y < 0:
      self.y = 0

    if self.id == 0:
      self.id = playerid

  def render(self):
    screen.blit(sprites[self.id % 4], (self.x, self.y))


#game events
#['event type', param1, param2]
#
#event types: 
# id update 
# ['id update', id]
#
# player locations
# ['player locations', [id, x, y], [id, x, y] ...]

#user commands
# position update
# ['position update', id, x, y]

class GameEvent:
  def __init__(self, vx, vy):
    self.vx = vx
    self.vy = vy

cc = Minion(50, 50, 0)

minions = []

while True:
  ins, outs, ex = select.select([s], [], [], 0)
  for inm in ins: 
    gameEvent = pickle.loads(inm.recv(BUFFERSIZE))
    if gameEvent[0] == 'id update':
      playerid = gameEvent[1]
      print(playerid)
    if gameEvent[0] == 'player locations':
      gameEvent.pop(0)
      minions = []
      for minion in gameEvent:
        if minion[0] != playerid:
          minions.append(Minion(minion[1], minion[2], minion[0]))
    
  for event in pygame.event.get():
    if event.type == QUIT:
    	pygame.quit()
    	sys.exit()
    if event.type == KEYDOWN:
      if event.key == K_LEFT: cc.vx = -10
      if event.key == K_RIGHT: cc.vx = 10
      if event.key == K_UP: cc.vy = -10
      if event.key == K_DOWN: cc.vy = 10
    if event.type == KEYUP:
      if event.key == K_LEFT and cc.vx == -10: cc.vx = 0
      if event.key == K_RIGHT and cc.vx == 10: cc.vx = 0
      if event.key == K_UP and cc.vy == -10: cc.vy = 0
      if event.key == K_DOWN and cc.vy == 10: cc.vy = 0

  clock.tick(60)
  screen.fill((255,255,255))

  cc.update()

  for m in minions:
    m.render()

  cc.render()

  pygame.display.flip()

  ge = ['position update', playerid, cc.x, cc.y]
  s.send(pickle.dumps(ge))
s.close()

server.py

import socket
import asyncore
import select
import random
import pickle
import time

BUFFERSIZE = 512

outgoing = []

class Minion:
  def __init__(self, ownerid):
    self.x = 50
    self.y = 50
    self.ownerid = ownerid

minionmap = {}

def updateWorld(message):
  arr = pickle.loads(message)
  print(str(arr))
  playerid = arr[1]
  x = arr[2]
  y = arr[3]

  if playerid == 0: return

  minionmap[playerid].x = x
  minionmap[playerid].y = y

  remove = []

  for i in outgoing:
    update = ['player locations']

    for key, value in minionmap.items():
      update.append([value.ownerid, value.x, value.y])
    
    try:
      i.send(pickle.dumps(update))
    except Exception:
      remove.append(i)
      continue
    
    print ('sent update data')

    for r in remove:
      outgoing.remove(r)

class MainServer(asyncore.dispatcher):
  def __init__(self, port):
    asyncore.dispatcher.__init__(self)
    self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
    self.bind(('', port))
    self.listen(10)
  def handle_accept(self):
    conn, addr = self.accept()
    print ('Connection address:' + addr[0] + " " + str(addr[1]))
    outgoing.append(conn)
    playerid = random.randint(1000, 1000000)
    playerminion = Minion(playerid)
    minionmap[playerid] = playerminion
    conn.send(pickle.dumps(['id update', playerid]))
    SecondaryServer(conn)

class SecondaryServer(asyncore.dispatcher_with_send):
  def handle_read(self):
    recievedData = self.recv(BUFFERSIZE)
    if recievedData:
      updateWorld(recievedData)
    else: self.close()

MainServer(4321)
asyncore.loop()

When I run the app in the mac terminal on python 3.9.1, I get the error:

s.connect((serverAddr, 4321))
ConnectionRefusedError: [Errno 61] Connection refused

Is there a solution?

When I run the app in the mac terminal on python 3.9.1, I get the error:

s.connect((serverAddr, 4321))
ConnectionRefusedError: [Errno 61] Connection refused

Is there a solution?

You need to change the address to your local ip or your hoes machine name