Re: Two Dictionaries and a Sum!
In article <6012d69f-b65e-4d65-90c4-f04876853...@googlegroups.com>, Bradley Wright wrote: > Confusing subject for a confusing problem (to a novice like me of course!) > Thx for the help in advance folks > > I have (2) dictionaries: > > prices = { > "banana": 4, > "apple": 2, > "orange": 1.5, > "pear": 3 > } > > stock = { > "banana": 6, > "apple": 0, > "orange": 32, > "pear": 15 > } > > Here's my instructions: Hmmm, homework for a class? > consider this as an inventory and calculate the sum (thats 4*6 = 24 bananas!) I suspect what you're trying to say is that bananas cost BTC 4 each, and since you've got 6 bananas, you've got BTC 24 worth of bananas, yes? And now you want to find the total value of your fruit supply? >> HERES MY CODE: > > for key in prices: > print prices[key]*stock[key] > > HERES THE OUTPUT: > > 48.0 > 45 > 24 > 0 So far, so good. A couple of things you may have noticed along the way: 1) Your orange unit price was a float, so the total value of all your oranges is a float as well. That's how math works in Python. 2) The keys are presented in random order. To make the output easier to interpret, you might want to do: print key, prices[key]*stock[key] > ISSUE: > I need to find a way to add all of those together...any pointers? The most straight-forward way would be something like: total = 0 for key in prices: fruit_subtotal = prices[key]*stock[key] total += fruit_subtotal print key, fruit_subtotal print total There are better ways to do this in Python, but start like this and get that to work. -- http://mail.python.org/mailman/listinfo/python-list
Re: Two Dictionaries and a Sum!
total,amount=0,0 for key in prices.keys(): amount=prices[key]*stock[key] total+=amount print "%s %s" % (amount,total) -- http://mail.python.org/mailman/listinfo/python-list
Re: Two Dictionaries and a Sum!
total,amount=0,0 for key in prices.keys(): price=prices[key]*stock[key] total+=price print "%s %s" % (price,total) -- http://mail.python.org/mailman/listinfo/python-list
Re: Two Dictionaries and a Sum!
On Sat, May 18, 2013 at 2:19 PM, Bradley Wright wrote: > Confusing subject for a confusing problem (to a novice like me of course!) > Thx for the help in advance folks > > I have (2) dictionaries: > > prices = { > "banana": 4, > "apple": 2, > "orange": 1.5, > "pear": 3 > } > > stock = { > "banana": 6, > "apple": 0, > "orange": 32, > "pear": 15 > } > > Here's my instructions: > > consider this as an inventory and calculate the sum (thats 4*6 = 24 bananas!) Let me reword your problem a little, maybe it'll be a bit clearer. You're trying to calculate the total value of all stock on hand, eg for insurance purposes. That's not 24 bananas, that's $24 of bananas. And the part you want now is to get the total value of your entire stock. Great! You're very close to there... > HERES MY CODE: > > for key in prices: > print prices[key]*stock[key] > > ISSUE: > I need to find a way to add all of those together...any pointers? ... you just need to accumulate a sum. Since this is almost certainly homework, I won't give you the answer, but here are a few pointers: * You'll need a single variable (I use the term sloppily, Python doesn't actually have variables per se) which will collect the final total. * Inside your loop, you're currently printing out an int/float with the value of the current item. Just add it onto your accumulator. * Python will happily work with integers and floats together, so you can just do what's obvious and it'll work. See where that takes you. Have fun! :) ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Two Dictionaries and a Sum!
for key in prices.keys(): print prices[key]*stock[key] On Sat, May 18, 2013 at 12:19 PM, Bradley Wright < bradley.wright@gmail.com> wrote: > Confusing subject for a confusing problem (to a novice like me of course!) > Thx for the help in advance folks > > I have (2) dictionaries: > > prices = { > "banana": 4, > "apple": 2, > "orange": 1.5, > "pear": 3 > } > > stock = { > "banana": 6, > "apple": 0, > "orange": 32, > "pear": 15 > } > > Here's my instructions: > > consider this as an inventory and calculate the sum (thats 4*6 = 24 > bananas!) > > HERES MY CODE: > > for key in prices: > print prices[key]*stock[key] > > HERES THE OUTPUT: > > 48.0 > 45 > 24 > 0 > > ISSUE: > I need to find a way to add all of those together...any pointers? > -- > http://mail.python.org/mailman/listinfo/python-list > -- *Space Lee* -- http://mail.python.org/mailman/listinfo/python-list