while loop help

[jhall710]

Hey everyone, have all of my code correct thus far (so I think lol) but steps 6 & 7 have me very lost. My instructor never gave us any information on swaps and I'm thinking there is to be a loop within a loop but i'm not sure if that is even possible with python. Appreciate any help/direction

1. Draw five adjacent boxes and number the boxes 0 though 4
   
   
2. Put the following numbers in boxes 0 - 4, one number per box: 6 8 4 5 2
   

1. Draw a box, label the box I, write the number 0 in box I
   
   
2. Draw a box, label the box J, write the number 999 in box J
   
   
3. If the number in box I is less than 5 then do the next instruction, otherwise do instruction 12
   
   
4. Replace the number in box J with 0
   
   
5. If the number in box J is less than 4 then do the next instruction, otherwise do instruction 10
   
   
6. If the number in the numbered box whose box number is the same as the number in box J is greater than the number in the box that follows then do the next instruction, otherwise do instruction 8
   
   
7. Swap the value in the box whose box number is the same as the number in box J with the value in the box that follows
   
   
8. Replace the number in box J with the number that is one more than the number currently in box J
   
   
9. Go back and do instruction 5 again
   
   
10. Replace the number in box I with the number that is one more than the number currently in box I
    
    
11. Go back and do instruction 3 again
    
    
12. You are done
    

list_ = [6,8,4,5,2]
I = 0
J = 999
while I < 5:
  J = 0
  while J < 4:
    
    
  J = J + 1
  I = I + 1

[Larz60+]

Since your instructions use the word 'draw' with boxes, I have to assume that you're expected to use a GUI.
You have none in your code.
Which GUI's did you cover in class?

[jhall710]

Thats just in there because we were to draw out the algorithm on paper and now the second portion is to code it

[Larz60+]

Then be clear, how do you want the output to look (example please)

[smbx33]

list_ = [6,8,4,5,2]
I = 0
J = 999
while I < 5:
   J = 0
   while J < 4:
       if list_[J]> list_[J+1]:    # This if statement will check values in list and then...
           list_[J],list_[J+1] = list_[J+1],list_[J]    # swap the values if the item after it has a lesser value
           J += 1
           I += 1
       else:
            J += 1
            I += 1
print(list_)

Without knowing exactly what the output should be I won't know if its correct, but judging by the steps you are stuck at, it looks like it wants you to swap values in a list.

[jhall710]

the output should be [2, 4, 5, 6, 8]

[ichabod801]

Then you need to indent line n, so it is under the j loop; and write step 7 on line 7 with the same indentation (see smbx33's line 8).

[jhall710]

hmm still confused by what you mean. what do you mean by line n?

[ichabod801]

That was a typo, I meant line 9.

[jhall710]

I keep getting the same output [4, 5, 2, 6, 8] instead of [2, 4, 5, 6, 8]

here's my code

list_ = [6,8,4,5,2]
I = 0
J = 999
while I < 5:
  J = 0
  while J < 4:
      list_[J], list_[J + 1] = list_[J + 1], list_[J]  # This if statement will check values in list and then...
      J += 1
      I += 1
print(list_)