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Oct 31st, 2008

Why Isn't This Working?

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Okay heres my code...

for swipeload in range (0, 15, 1):
    "E"+str(swipeload)+"_Path" = os.path.join("data","E"+str(swipeload)+".gif")
    "E"+str(swipeload) = pygame.image.load("E"+str(swipeload)+"_Path")

So basically I have a bunch of images called "E1, E2, E3, E4, etc..." and I want to load them all into the cache without having to type the code for every single image....

But why doesn't this bit of code seem to work? I know it has to do something with the str() code but idk what :-(

Heres how I would normally load one of these images....

(Toggle Plain Text)

    E1_Path = os.path.join("data", "E1.gif")
    E1 = pygame.image.load(E1_Path)

The error says "Can't assign to operator".....

Any Help?!? Thanks

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iamoldest

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Oct 31st, 2008

Re: Why Isn't This Working?

Yeah you cant assign values to a string. Thats what your program is trying to do. Well i would advise using a dictionary for this one:

python Syntax (Toggle Plain Text)
d1 = {}
d2 = {}
for swipeload in range (0, 15, 1):
    d1["E"+str(swipeload)+"_Path"] = os.path.join("data","E"+str(swipeload)+".gif")
    d2["E"+str(swipeload)] = pygame.image.load("E"+str(swipeload)+"_Path")
d1 = {}
d2 = {}
for swipeload in range (0, 15, 1):
    d1["E"+str(swipeload)+"_Path"] = os.path.join("data","E"+str(swipeload)+".gif")
    d2["E"+str(swipeload)] = pygame.image.load("E"+str(swipeload)+"_Path")

This now has a dictionary where the string values are the keys and the values are what you want. The first dictionary holds the path while the second dictionary holds the image.

Hope that helps

Last edited by Paul Thompson; Oct 31st, 2008 at 5:43 pm.

Paul Thompson

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Oct 31st, 2008

Re: Why Isn't This Working?

Alternatively you could do this:

python Syntax (Toggle Plain Text)
for swipeload in range (0, 15, 1):
	exec('E'+str(swipeload)+'_Path = os.path.join("data","E"+str(swipeload)+".gif")')
	exec('E'+str(swipeload)+' = pygame.image.load("E"+str(swipeload)+"_Path")')
for swipeload in range (0, 15, 1):
	exec('E'+str(swipeload)+'_Path = os.path.join("data","E"+str(swipeload)+".gif")')
	exec('E'+str(swipeload)+' = pygame.image.load("E"+str(swipeload)+"_Path")')

But dictionaries are a better option.

Last edited by tyincali; Oct 31st, 2008 at 6:47 pm.

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Nov 1st, 2008

Re: Why Isn't This Working?

I would suggest lists like this

python Syntax (Toggle Plain Text)
cnt_img = 15
E_Path = [os.path.join("data", "E%d.gif" % k) for k in xrange(cnt_img)]
E = [pygame.image.load(E_Path[k]) for k in xrange(cnt_img)]
cnt_img = 15
E_Path = [os.path.join("data", "E%d.gif" % k) for k in xrange(cnt_img)]
E = [pygame.image.load(E_Path[k]) for k in xrange(cnt_img)]

Then you can use E[k] and E_Path[k] to get the k-th image or path.

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Nov 3rd, 2008

Re: Why Isn't This Working?

mabey you could re-write it like this:
[code=python]

cnt_img = 15
E_Path = [os.path.join("data", "E%d.gif" % k) for k in xrange(cnt_img)]
E = [pygame.image.load(E_Path[k]) for k in xrange(cnt_img)]
cnt_img = 15 E_Path = [os.path.join("data", "E%d.gif" % k) for k in xrange(cnt_img)] = [pygame.image.load(E_Path[k]) for k in xrange(cnt_img)]

Now use E[k] and E_Path[k] to get the k-th image

Last edited by tomtetlaw; Nov 3rd, 2008 at 7:38 pm. Reason: i made a mistake

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