python - string index out of range list iteration -

i new python, not sure on how fix index string out of range. happens right after while loop when want send mylist[i][0] formatting function. pointer on code in general 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]         = + 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])             += 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])             += 1                                   else:             print(" " * margin + " ".join(list2))             list2 = []             count = 0 

change

i <= len(mylist) 

to

i < len(mylist)