CODEWITHSUNDEEP
pythonindexingrange
Op.Ivy
Op.Ivy

Reputation: 81

IndexError...out of range,

Following on from the awesome help from earlier, I now have an issue with exception handling. I've got a list of 11 plots to be selected by their index number. If the user selects higher than 11, it should request they re-enter but atm, I get IndexError: list index out of range. I would've thought the except line would just handle anything else...but it must just be a missing line??

try:
    response = raw_input("Select a monitoring plot from the list (0-11): ")
    if response == 'q':
        confirm = raw_input('Confirm quit (y/ n)...')
            if confirm == 'y':
                print 'Bye'
                break
            else:
                continue
    selected = dataList[int(plotSelect) + 1]
    print 'You selected : ', selected[1]
except ValueError:
    print "Error: Please enter a number between 0 and 11"

Upvotes: 0

Views: 237

Answers (3)

Felipe
Felipe

Reputation: 3149

ValueError will come up when he user inputs something that isn't a number. (So int("hello") throws ValueError)

IndexError is thrown when the user inputs a number greater than the number of elements in the list. (Eg, range(5)[7]

You may want to try getting your first input with a loop like the following

resp = ""
while resp not in ('0', '1', ... '10', 'q'):
    resp = raw_input(...)

Upvotes: 0

Blender
Blender

Reputation: 298176

except ValueError only catches a ValueError. You need to add IndexError as well:

except (ValueError, IndexError):

Upvotes: 4

Colonel Panic
Colonel Panic

Reputation: 1614

except ValueError means you only catch execptions of the type ValueError. Include a catch for IndexError if you want to handle it differently, or catch both and handle it the same way.

Upvotes: 0

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