Python w/ Pygame - The diffrence between these two sets?
Question: I'm using Python 2.7 and Pygame 1.9.1 The fact that there are a few things
that pygame and IDLE do not like each other is irrelevant as I attempted to
run it as a .py file as well.

_This works:_

    
    
    import pygame
    
    y = 0
    dir = 1
    running = 1
    width = 800
    height = 600
    screen = pygame.display.set_mode((width, height))
    linecolor = 255, 0, 0
    bgcolor = 0, 0, 0
    
    while running:
        event = pygame.event.poll()
        if event.type == pygame.QUIT:
            running = 0
    
        screen.fill(bgcolor)
        pygame.draw.line(screen, linecolor, (0, y), (width-1, y))
    
        y += dir
        if y == 0 or y == height-1: dir *= -1
    
        pygame.display.flip()
    

_But this does not work:_

    
    
    import pygame
    
    y = 0
    dir = 1
    running = 1
    width = 800
    height = 600
    linecolor = 255, 0, 0
    bgcolor = 0, 0, 0
    screen = pygame.display.set_mode((640, 400))
    
    
    while running:
            event = pygame.event.poll()
            if event.type == pygame.QUIT:
                running = 0
    
            screen.fill(bgcolor)
            pygame.draw.aaline(screen, linecolor, (0, y), (width-1, y)
    
            y += dir
            if y == 0 or y == height-1: dir *= -1
    
            pygame.display.flip()
    

Could anybody explain the differences and why one works over the other?

The only diffrence appears to be the the two lines locations:

    
    
    linecolor = 255, 0, 0
    

and

    
    
    bgcolor = 0, 0, 0
    


Answer: But that's not the only difference. This is a syntax error:

    
    
        pygame.draw.aaline(screen, linecolor, (0, y), (width-1, y)
    

It also differs from the above in that it calls `aaline` instead of `line` and
is indented 8 spaces instead of 4. Any of these differences could be causing a
problem (since the 8-space indention, to me, suggest a possible mix of tabs
and spaces.)

Also, in general, it's a good idea to post a stack trace when you get an error
from a piece of code. They contain useful information.

