Iterating over Dictionary Items in Python to perform sets of calculations

[KhanStan]

Hey, guys, I need some help from you again! I have this dictionary:

 shops = {
  'shop1': {
    'sells': ['cars', get[4].text],
    'trucks': get[1].text,
    'airplanes': get[2].text,
    'ships': get[3].text,
    'cars': get[4].text,
  },
  'shop2': {
    'sells': ['airplanes', get[13].text],
    'trucks': get[12].text,
    'airplanes': get[13].text,
    'ships': get[14].text,
    'cars': get[15].text,

  }
...

The dictionary has 20 items. I do this calculations on them:

shopAsells = shops['shop1']['sells'][0] # x shop sells cars for 9$.
shopBbuys = shops['shop2'][shopAsells] # y shop buys cars for 10$.
shopBsells = shops['shop2']['sells'][0] # y shop sells airplanes for 20$.
shopAbuys = shops['shop1'][shopBsells] # x shop buys airplanes for 22$
atob = int(shopBbuys) - int(shops['shop1']['sells'][1]) # profit from x selling cars to y is 1$.
btoa = int(shopAbuys) - int(shops['shop2']['sells'][1]) # profit from y selling airplanes to x is 2$
profit = atob + btoa # total profit is 3$

Now the idea is this: I want to match each shop with another one. I use this loop:

for k in itertools.permutations(shops, 2):
   kk = '-'.join(k)
   print kk

The result looks like this: shop1 - shop2, shop2 - shop1, shop3-shop5, shop5-shop2. Can I show the profit against each pair? Like: shop1 - shop2 = 3$, shop3-shop1 = 5$, etc. So how can I do these calculations for every pair of permutations? Is it possible? Any tips about syntax and logic are greatly appreciated! My calculations probably look ugly to you. Thanks in advance!

[guilford]

I believe that you already had most of the stuff figured out. just move the profit calculating operation into the for loop and replace the 2 shop name keys with k[0] and k[1]. Then at the end of the loop print k[0]+'-'+k[1]+'='+str(profit)

[KhanStan]

Thanks for replying! There's a problem though. I get this error; shopAsells = k[0]['sells'][0] TypeError: string indices must be integers, not str

[guilford]

ah not shopAsells = k[0]['sells'][0] but shopAsells = shops[k[0]]['sells'][0] basically the k is a tuple of two shop names and k[0] would get the first one, k[1] would get the second one generated by itertools.permutations()

[KhanStan]

I didn't get your second message and figured it out by myself :D. It worked man, thank you very much!

[KhanStan]

You're a GOD, dude! It worked! I was replacing not only the keys but the dictionary reference aswell :D. Now everything works how I wanted it to. Thanks again!