Python

Why Isn't This Working?

Please support our Python advertiser: Programming Forums - DaniWeb Sister Site

•

Join Date: Mar 2008

Posts: 9

Reputation: iamoldest is an unknown quantity at this point

Solved Threads: 0

iamoldest

Offline

Newbie Poster

Why Isn't This Working?

Oct 31st, 2008

Okay heres my code...

Help with Code Tags

(Toggle Plain Text)

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....

Help with Code Tags

(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

•

Join Date: May 2008

Posts: 950

Reputation: Paul Thompson has a spectacular aura about

Solved Threads: 147

Paul Thompson Paul Thompson is offline

Offline

previously paulthom12345

Re: Why Isn't This Working?

Oct 31st, 2008

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:

 Help with Code Tags 
 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.

Make it idiot proof and someone will make a better idiot.
Check out my Site | and join us on IRC | Python Specific IRC

•

Join Date: Oct 2008

Posts: 45

Reputation: tyincali is an unknown quantity at this point

Solved Threads: 6

tyincali

Offline

Light Poster

Re: Why Isn't This Working?

Oct 31st, 2008

Alternatively you could do this:

 Help with Code Tags 
 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.

I wish I had something cool to put here...

•

Join Date: Jul 2008

Posts: 984

Reputation: Gribouillis is a jewel in the rough

Solved Threads: 222

Gribouillis Gribouillis is offline

Offline

Posting Shark

Re: Why Isn't This Working?

Nov 1st, 2008

I would suggest lists like this

 Help with Code Tags 
 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.

•

Join Date: Sep 2008

Posts: 382

Reputation: tomtetlaw is an unknown quantity at this point

Solved Threads: 4

tomtetlaw

Offline

Posting Whiz

Re: Why Isn't This Working?

Nov 3rd, 2008

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

...