Pygame Rotation... Need help!

#pygame Test by KNovak
#need some help... can't seem to reconcile the sprite rotation with the sprite group update
#vs the rect blit function!

import pygame, sys, os
from pygame.locals import *
pygame.init()
pygame.key.set_repeat(1)
fullscreen = False;

#startup settings
for arg in sys.argv:
    if arg == "-f":
        fullscreen = True


#Video Display information
vidinfo = pygame.display.Info()

if fullscreen == True:
    vidsize = (vidinfo.current_w, vidinfo.current_h)
    window = pygame.display.set_mode(vidsize, pygame.FULLSCREEN)
else:
    window = pygame.display.set_mode((640,480))
pygame.display.set_caption('KNova Test Window')
screen = pygame.display.get_surface()
background = pygame.Surface((screen.get_width(), screen.get_height()))

#colors
WHITE = (255,255,255)
BLUE = (0,0,150)
GREEN = (0,150,0)

#text
def drawText (text, color, xloc, yloc, size):
    fontObj = pygame.font.Font('freesansbold.ttf', size)
    textSurface = fontObj.render(text, True, color)
    textRectObj = textSurface.get_rect()
    textRectObj.center = (xloc, yloc)
    return textSurface, textRectObj

#Sprite Class for the Ship Image
class Ship(pygame.sprite.Sprite):
    image = pygame.image.load("./resources/ship.png")
    image= image.convert()

    #initialization function
    def __init__(self, position=(100,100)):
        pygame.sprite.Sprite.__init__(self,self.groups)
        self.pos = position
        self.image = Ship.image
        self.rect = self.image.get_rect()
        #initial drawing
        self.rect.center = self.pos
        self.angle = 0

    #move function
    def move(self, dx, dy):
        oldx, oldy = self.pos
        self.pos = (oldx + dx, oldy - dy)
        self.rect.center = self.pos

    #rotate - it's counterclockwise by default
    def rotate(self):
        if self.angle >= 360:
            self.angle = 0
        if self.angle <= -360:
            self.angle = 0
        loc = self.rect.center
        rotimage = pygame.transform.rotate(self.image, self.angle)
        rotrect = rotimage.get_rect()
        rotrect.center = loc
        screen.blit(rotimage,rotrect)
        print rotrect


spriteGroup = pygame.sprite.Group()
Ship.groups = spriteGroup
newShip = Ship()

#sprite group update
def spriteUpdate(group, screen, background):
    group.clear(screen, background)
    group.update()
    group.draw(screen)




#get keyboard events
def pyin(events):
    for event in events:
        if event.type == QUIT:
            sys.exit(0)
        if event.type == KEYDOWN:
            key = pygame.key.get_pressed()
            if (key[pygame.K_ESCAPE]):
                sys.exit(0)
            if (key[K_UP]):
                newShip.move(0,3)
            if (key[K_DOWN]):
                newShip.move(0,-3)
            if (key[K_LEFT]):
                newShip.angle += 3
                newShip.rotate()
            if (key[K_RIGHT]):
                newShip.angle -= 3
                newShip.rotate()


while True:
    pyin(pygame.event.get())
#   pykey(pygame.key.get_pressed())
    pygame.display.update()
    spriteUpdate(spriteGroup, screen, background)