python - unsupported operand type(s) for +=: 'int' and 'NoneType' -

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def movewall (paddlewall, paddlewalldiry):     paddlewall.y+=paddlewalldiry     return paddlewall  def main():     pygame.init()     global displaysurf     ##font information     global basicfont, basicfontsize     basicfontsize = 20     basicfont = pygame.font.font('freesansbold.ttf', basicfontsize)      fpsclock = pygame.time.clock()     displaysurf = pygame.display.set_mode((windowwidth,windowheight))      pygame.display.set_caption('pong')      #initiate variable , set starting positions     #any future changes made within rectangles     wallx = windowwidth/2 - linethickness/2     wally = (windowheight)/2 - linethickness/2     ballx = windowwidth/2 - linethickness/2     bally = windowheight/2 - linethickness/2     playeroneposition = (windowheight - paddlesize) /2     playertwoposition = (windowheight - paddlesize) /2     score = 0      #keeps track of ball direction     balldirx = -1 ## -1 = left 1 = right     balldiry = -1 ## -1 = 1 = down     paddlewalldirx = 0     paddlewalldiry = 1      #creates rectangles ball , paddles.     paddle1 = pygame.rect(paddleoffset,playeroneposition, linethickness,paddlesize)     paddle2 = pygame.rect(windowwidth - paddleoffset - linethickness, playertwoposition, linethickness,paddlesize)     paddle3 = pygame.rect(paddleoffset,playeroneposition, linethickness,paddlesize)     paddlewall = pygame.rect(wallx, wally, linethickness, 100)       ball = pygame.rect(ballx, bally, linethickness, linethickness)      #draws starting position of arena     drawarena()     drawpaddle(paddle1)     drawpaddle(paddle2)     drawpaddle(paddle3)     drawpaddle(paddlewall)     drawball(ball)      pygame.mouse.set_visible(0) # make cursor invisible      while true: #main game loop         event in pygame.event.get():             if event.type == quit:                 pygame.quit()                 sys.exit()             # mouse movement commands             elif event.type == mousemotion:                 mousex, mousey = event.pos                 paddle1.y = mousey                 paddle3.y = mousey - 100          drawarena()         drawpaddle(paddle1)         drawpaddle(paddle2)         drawpaddle(paddle3)         drawpaddle(paddlewall)         drawball(ball)          paddlewall = movewall(paddlewall, paddlewalldiry)         ball = moveball(ball, balldirx, balldiry)         balldirx, balldiry = checkedgecollision(ball, balldirx, balldiry)         paddlewalldiry = checkedgecollisionwall(paddlewall, paddlewalldiry)         score = checkpointscored(paddle1, paddle3, ball, score, balldirx)         balldirx = balldirx * checkhitball(ball, paddle1, paddle2, paddle3, paddlewall, balldirx)         paddle2 = artificialintelligence (ball, balldirx, paddle2)

i can't fix , did give paddlewalldiry value of 1 in main method

your second parameter none either directly:

movewall(pw, none)

or indirectly:

x = none ... movewall(pw, x)

please note none value can result of function call, example.


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