[Tutor] Python program malfunction

[Dave Angel]

On 05/04/2015 07:08 PM, Jag Sherrington wrote:
> Hi, Alan>



Please don't top-post.  Enter your new message *after* whatever portion 
of the previous message you're quoting.  I'm rearranging the portion of 
your message to conform to that standard.

>
>
>       On Monday, 4 May 2015, 17:35, Alan Gauld <alan.gauld at btinternet.com> wrote:
>
>
>> # Process one or more items.
>> while another == 'y' or another == 'y':
>
> That's the same test twice. Is that what you meant?
>
>>        #Get the item 's wholesale cost'
>>        wholesale = float(input("Enter the item's wholesale cost: "))
>>
>>        # Validate the wholesale cost.
>>        while wholesale < 0:
>>            print('ERROR: the cost cannot be negative.')
>>            wholesale = float(input('Enter the correct wholesale cost: '))
>>
BUG on following line:
>>            #Calculate the retail price.
>>            retail = wholesale * mark_up
>>
>>            #Display the retail price.
>>            print('Retail price: $', format(retail, ',.2f'), sep='')
>>
>>            #Do this again.
>>            another = input('Do you have another item? ' + \
>>                            '(Enter y for yes): ')
>>
>> HERE ARE THE RESULTS:
>>
>> Enter the item's wholesale cost: 0.50
>> Enter the item's wholesale cost:    (THIS SEEMS TO BE A PROBLEM)
>
> No problem, its exactly what your program tells it to do.
> If the cost is >0 there is nothing else to do so it goes
> round the loop a second time.
>
> What did you expect it to do?
>
 > Enter the item's wholesale cost: 0.50 (AFTER THIS LINE PRINTS I HIT
 > ENTER AND WOULD EXPECT THE NEXT LINE TO GIVE ME THE RESULT>
 > Enter the item's wholesale cost:    "Retail price: $1.25"
 > INSTEAD WHEN I HIT ENTER I GET "Enter the item's
 >  wholesale cost: " AGAIN AND AGAIN

(See Peter's comment as well as Alan's second one.)

All the rest of your logic is inside the while loop that's only run when 
the wholesale < 0 branch is taken.  So you don't see any output from it, 
as it never runs unless you enter a negative value followed by a 
positive one.

You have to fix the indentation of the lines starting "#Calculate the 
retail price"



-- 
DaveA