string index out of range list iteration

Question

I am fairly new to python, I am not sure on how to fix a index string out of range. it happens right after the while loop when I want to send mylist[i][0] to formatting function. Any pointer on my code in general would be awesome!

    def formatting(str1):

if str1 == '?':
    return True
else:
    return False

while(i <= len(mylist)):
    val = formatting(mylist[i][0])
    if val == True:
        str1 = mylist[i]
        str2 = mylist[i+1]
        i = i + 2
        format_set(str1, str2)
    else:
        if format == True:
            if (margin + count + len(mylist[i])) <= width:
                if (i == (len(mylist)-1)):
                    list2.append(mylist[i])
                    print(" " * margin + " ".join(list2))   
                    break
            list2.append(mylist[i])
            count += len(mylist[i])
            i += 1                          
        else:
            print(" " * margin + " ".join(list2))
            list2 = []
            count = 0
    else:
        temp_margin = margin
        temp_width = width
        width = 60
        margin = 0
        if (margin + count + len(mylist[i])) <= width:
            if (i == (len(mylist)-1)):
                list2.append(mylist[i])
                print(" " * margin + " ".join(list2))
                margin = temp_margin
                width = temp_width
                break
            list2.append(mylist[i])
            count += len(mylist[i])
            i += 1                          
        else:
            print(" " * margin + " ".join(list2))
            list2 = []
            count = 0

Use 4 spaces to introduce correct indentation in your code. TAB doesn't work for this here. — Islay
– Islay, Commented Jun 26, 2014 at 3:25

Wcrousse · Accepted Answer · 2014-06-26 03:14:55Z

1

change

i <= len(mylist)

to

i < len(mylist)

answered Jun 26, 2014 at 3:14

Wcrousse

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1 Comment

Wcrousse Over a year ago

you'll still have to deal with the mylist[i+1] that Abhi mentioned.

Islay · Accepted Answer · 2014-06-26 03:16:54Z

1

In the last iteration of the while loop, i is referring to the last value. Hence,

str2 = mylist[i+1]

is trying to reference a string outside the allowed range and you get an error.

EDIT: Also, as Wcrousse mentioned, the while (i <= len(...)) should be changed to i < len(...) because indexes go from 0 - (length-1).

edited Jun 26, 2014 at 3:16

answered Jun 26, 2014 at 3:04

Islay

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4 Comments

user3777576 Over a year ago

I get the error on the line val = formatting(mylist[i][0]), it doesn't get a chance to make it to the str2 = mylist[i+1]

Islay Over a year ago

Post your definition of formatting(). It is likely making the same mistake within.

Islay Over a year ago

Wcrousse's answer was the main reason for your issue. Using i <= len(mylist) would push the last iteration of i outside the range.

user3777576 Over a year ago

with changing it to i < len(mylist) I still get the error. for the str2 = mylist[i+1] if it makes it to that point there is for sure a i+1

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