Issue with script using Pygame - python-2.7

Question

I'm writing a small game in my spare time. This is what I have so far:
from pygame import * #import relevant modules
from PIL import Image
import os, sys
init() #initialise
class sprite:
def __init__(self, object, x = 0, y = 0, w = 0, h = 0):
self.image = image.load(object).convert()
self.posx = x
self.posy = y
self.position = ((x, y, w, h))
def resize(self, sh, sw):
self.image = transform.scale(self.image, (sh, sw))
return self.image
def move(self, window, background, right, down):
self.posx = x + right
self.posy = y + down
window.blit(background, self.position, self.position)
self.position.move(right, down)
window.blit(self, self.position)
window.update()
os.chdir('C:\\Users\\alesi\\Documents\\Pygame\\Project\\') #current folder change
win = display.set_mode((736, 552))#load window
Clock = time.Clock() #handy clock
background = image.load('background.jpg').convert()#load images
player = sprite('ball.png', 350, 275, 20, 20)
player = player.resize(20, 20)
win.blit(background, (0, 0))
win.blit(player, (350, 275))
display.update()
while True:
event.pump()
keys = key.get_pressed()
if keys[K_ESCAPE]:
sys.exit()
elif keys[K_RIGHT]:
player.move(win, background, 20, 0)
elif keys[K_LEFT]:
player.move(win, background, -20, 0)
elif keys[K_DOWN]:
player.move(win, background,0, 20)
elif keys[K_UP]:
player.move(win, background, 0, -20)
In short, it should create an object on a background and allow you to move the object using the arrow keys. However, I get the error:
C:\Users\alesi\Documents\Pygame\Project>python2 game2.py
Traceback (most recent call last):
File "game2.py", line 51, in <module>
player.move(win, background, -20, 0)
AttributeError: 'pygame.Surface' object has no attribute 'move'
I'm struggling to understand why my player instance of the sprite class is not recognising the move method. Also, I'm confused by why during the win.blit() function, I have to give the argument player instead of player.image, the attribute which I've stored the image.
Any advice would be appreciated.

Answer 1

In code
def resize(self, sh, sw):
self.image = transform.scale(self.image, (sh, sw))
return self.image
you returns image which is Surface instance - so in line
player = player.resize(20, 20)
you replace sprite instance with Surface instance
But you don't have to assign it to player again.
Do:
def resize(self, sh, sw):
self.image = transform.scale(self.image, (sh, sw))
# without return
# without player =
player.resize(20, 20)
After that player.move(...) will work again.
And again you will have to use player.image in blit()