How to ask again for the index inside the new try statement

Question

Hello guys.

I am new to python (and programming in general), but since this is something that I have already encountered (not only in python) I would like to discuss it.

As Kenneth Love suggests, I have inserted a try statement with its except for the case that spot = int(index)-1 returns an error.

It works enough good at first sight but it is not completed. With the simple code I have entered, the console (when interpreting the new except case) returns back to the very initial input, while I want to ask again for ONLY the index (keeping the list item lastly inserted by the user.

How should I add this thing?

I need something like going back again to the "index input".

Here is the code I have inserted so far:

    if index:
      try:
        spot = int(index) - 1
        for item in new_list:
          shopping_list.insert(spot, item.strip())
          spot += 1
      except:
          print("Not a valid number! Please enter the item again a valid number!")
    else:
      for item in new_list:
        shopping_list.append(item.strip())

As said it works fine but it is not enough.

Any ideas?

ty

Vittorio

Answer 1 · 2014-11-06T17:33:44Z

November 6, 2014 5:33pm

So you want to keep the list they've given, but ask for a new number? I'd suggest moving the index-asking to a function and you keep asking for it until you're happy. Basically a new while loop inside everything else that keeps calling the get_an_index function you're going to write.

Answer 2 · 2014-12-07T03:35:21Z

December 7, 2014 3:35am

Hello, I tried as below. if any missing, please let me know.

shopping_list = []

def show_help():
  print('\nEnter your items shop for, separated each item with a comma.')
  print('Type DONE to done, SHOW to see current list, HELP to see this message.')

def show_list():
  count = 1
  for item in shopping_list:
    print('{}:{}'.format(count,item))
    count += 1

print('Please input the list which conteins you want to buy for!')
show_help()

while True:
  new_stuff = input('> ')

  if new_stuff.upper() == 'DONE':
    print("\nHere's your list")
    show_list()
    break

  elif new_stuff.upper() == 'SHOW':
    print("\nHere's your list")
    show_list()
    continue

  elif new_stuff.upper() == 'HELP':
    show_help()
    continue

  else:
    new_list = new_stuff.split(',')
    show_list()
    while True:
      index = input('Do you want to add these items at the end of the list? Please press Enter.\n'
                      'Or give me a number you want to add items to. Currently {} items in the list.'.format(len(shopping_list)))

      if index:
        try:
          spot = int(index) - 1
          for item in new_list:
            shopping_list.insert(spot, item.strip())
            spot += 1
          break
        except:
          print('Please input appropriate content!')
          continue
      else:
        for item in new_list:
          shopping_list.append(item.strip())
        break

Welcome to the Treehouse Community

Looking to learn something new?

Vittorio Somaschini

Vittorio Somaschini

How to ask again for the index inside the new try statement

2 Answers

Kenneth Love

Kenneth Love

KAZUYA NAKAJIMA

KAZUYA NAKAJIMA