Two Dictionaries and a Sum!
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?
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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
>
--
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--
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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
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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!
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!
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.
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