Python | Pygame | True

All I can say, is finally.

import pygame, math
from pygame import *

DISPLAY = (800,640)
DEPTH = 32
FLAGS = 0

##############################################################

# Classes!

class Entity(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)

##############################################################

class Player(Entity):
    def __init__(self, x, y):
        Entity.__init__(self)
        self.xvel = 0
        self.yvel = 0
        self.onGround = False
        self.image = Surface((32, 32))
        self.image.convert()
        self.image.fill(Color("#FF0000"))
        self.rect = Rect(x, y, 32, 32)
        
##############################################################

    def update(self, up, down, left, right, platforms):
        if up:
            # Only jump if on the ground
            if self.onGround:
                self.yvel -= 10
        if down:
            pass
        if left:
            self.xvel = -5
        if right:
            self.xvel = 5
        if not self.onGround:
            # Only accelerate with gravity if in the air
            self.yvel += 0.3
            # Max falling speed
            if self.yvel > 30:
                self.yvel = 30
        if not (left or right):
            self.xvel = 0
        # Increment in x direction
        self.rect.left += self.xvel
        # Do x-axis collisions
        self.collide(self.xvel, 0, platforms)
        # Incrememnt in y direction
        self.rect.top += self.yvel
        # Assuming we're in the air
        self.onGround = False;
        # Do y-axis collisions
        self.collide(0, self.yvel, platforms)

##############################################################

    def collide(self, xvel, yvel, platforms):
        for p in platforms:
            if sprite.collide_rect(self, p):
                if isinstance(p, ExitBlock):
                    event.post(event.Event(QUIT))
                if xvel > 0:
                    self.rect.right = p.rect.left
                if xvel < 0:
                    self.rect.left = p.rect.right
                if yvel > 0:
                    self.rect.bottom = p.rect.top
                    self.onGround = True
                    self.yvel = 0
                if yvel < 0:
                    self.rect.top = p.rect.bottom

##############################################################
                    
class Platform(Entity):
    def __init__(self, x, y):
        Entity.__init__(self)
        self.image = Surface((32, 32))
        self.image.convert()
        self.image.fill(Color("#DDDDDD"))
        self.rect = Rect(x, y, 32, 32)

    def update(self):
        pass

##############################################################

class ExitBlock(Platform):
    def __init__(self, x, y):
        Platform.__init__(self, x, y)
        self.image.fill(Color("#0033FF"))


#########################################################################################################################


def main():
    pygame.init()
    screen = display.set_mode(DISPLAY, FLAGS, DEPTH)
    display.set_caption('Use arrows to move!')
    timer = time.Clock()
    
    up = down = left = right = False
    bg = Surface((32, 32))
    bg.convert()
    bg.fill(Color("#000000"))
    entities = pygame.sprite.Group()
    player = Player(32, 32)
    platforms = []

##############################################################

    x = y = 0
    level = [
"PPPPPPPPPPPPPPPPPPPPPPPPP",
"P                       P",
"PP                      P",
"P PP                    P",
"P   PPP                 P",
"P      PPPP             P",
"P          PPPPP        P",
"P               PPPPP   P",
"P                       P",
"P                       P",
"P                      PP",
"P                    P  P",
"P                PPPPP  P",
"P         PPP           P",
"P             EEE       P",
"P                       P",
"P                  P    P",
"P                       P",
"P                       P",
"PPPPPPPPPPPPPPPPPPPPPPPPP",]

##############################################################

    for row in level:
        for col in row:
            if col == "P":
                p = Platform(x, y)
                platforms.append(p)
                entities.add(p)
            if col == "E":
                e = ExitBlock(x, y)
                platforms.append(e)
                entities.add(e)
            x += 32
        y += 32
        x = 0

##############################################################

    entities.add(player)
    running = True
    while running:
        timer.tick(100)
        for e in pygame.event.get():
            if e.type == QUIT:
                running =  False
            if e.type == KEYDOWN and e.key == K_UP:
                up = True
            if e.type == KEYDOWN and e.key == K_DOWN:
                down = True
            if e.type == KEYDOWN and e.key == K_LEFT:
                left = True
            if e.type == KEYDOWN and e.key == K_RIGHT:
                right = True

            if e.type == KEYUP and e.key == K_UP:
                up = False
            if e.type == KEYUP and e.key == K_DOWN:
                down = False
            if e.type == KEYUP and e.key == K_LEFT:
                left = False
            if e.type == KEYUP and e.key == K_RIGHT:
                right = False

##############################################################

        # Draw the background

        for y in range(20):
            for x in range(25):
                screen.blit(bg, (x * 32, y * 32))

        # Update the player, draw everything else

        player.update(up, down, left, right, platforms)
        entities.draw(screen)

        pygame.display.flip()

##############################################################

main()
pygame.quit()


##############################################################