Can't add two variables via a loop to a variable

Question

{'sm': ['q', 0.25, 1000], 'Bug Out Bag': ['q', 0.25, 100000000]}

Calculate for total amount, here's my code:

single_or_all_total = input('\nDo you want 1 bag or all the bags? (type: 1 for 1 bag, 2 for all bags)\n')
#calculate for a single bag
if int(single_or_all_total) == 1:
    single_bag_total = input('\nWhich bag? (e.g. type: small for the "small" bag)\n')
    if single_bag_total in coins_in_the_bag:
        total = coins_in_the_bag[single_bag_total][1] * coins_in_the_bag[single_bag_total][2]
        print('The total for bag {} was {}'.format(single_bag_total, total))
        #print(total)
    elif single_bag_total not in coins_in_the_bag:
        print('Sorry, this was not a valid bag. Please re-run file.')
    else:
        print('An error occurred, please re-run script.')

#calculate total for all bags
elif single_or_all_total == 2:
    total=0
    single_bag_total=0
    for coin in coins_in_the_bag:
        total += coins_in_the_bag[single_bag_total][1] * coins_in_the_bag[single_bag_total][2]
    print(total)

the problem is, when I run this, it returns nothing.

I can make my code hit the if int(single_or_all_total) == 1:, but if i input a 2 it doesnt crash at all, it just doesnt return anything.

I'm simply trying to loop through coins_in_the_bag, while adding each value to the total var: ( coins_in_the_bag[single_bag_total][1] * coins_in_the_bag[single_bag_total][2] ) but it is not outputting anything.

What am i doing wrong here?

Updated Error

    total += coins_in_the_bag[single_bag_total][1] * coins_in_the_bag[single_bag
_total][2]
UnboundLocalError: local variable 'total' referenced before assignment

hlt · Accepted Answer · 2015-12-07 19:05:34Z

2

You never hit the loop you suspected.

From your use of print as a function (and your conversions of single_or_all_total), I'm going to deduce that you are using Python 3.

Then, input returns a simple string, just like raw_input in Python 2.

You compare int(single_or_all_total) to 1 (which is fine, and works), and then single_or_all_total to 2. Note that this second version misses the conversion to a number - the string in single_or_all_total is never going to be equal to 2, only "2".

Instead, try elif int(single_or_all_total) == 2 or elif single_or_all_total == "2"

answered Dec 7, 2015 at 19:05

hlt

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4 Comments

Jshee Over a year ago

Good catch, although, this doesnt quite fix it all. Can you look at the updated error above, which still has to do with this "total" var.

hlt Over a year ago

total is not yet defined. Try putting total = 0 before the loop

Jshee Over a year ago

Please see updated, now giving me. total += coins_in_the_bag[single_bag_total][1] * coins_in_the_bag[single_bag _total][2] KeyError: 0

hlt Over a year ago

I don't know your exact data, so this is mostly guessing, but from the top branch of your if statement, I'm going to suggest you try using coin instead of single_bag_total here (because coin iterates over the same values as single_bag_total does above)

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