Question

I have a file that has sequence on line 2 and variable called tokenizer, which give me an old position value. I am trying to find the new position.. For example tokenizer for this line give me position 12, which is E by counting letters only until 12. So i need to figure out the new position by counting dashes…

—————LL—NE–HVKTHTEEK—PF-ICTVCR-KS———-

This is what i have so far it still doesn’t work.

with open(filename) as f:
    countletter = 0
    countdash = 0
    for line, line2 in itertools.izip_longest(f, f, fillvalue=''):
        tokenizer=line.split()[4]
        print tokenizer

        for i,character in enumerate(line2):

            for countletter <= tokenizer:

                if character != '-': 
                    countletter += 1
                if character == '-':
                    countdash +=1

my new position should be 32 for this example

Answer 1

First answer, edited by Chad D to make it 1-indexed (but incorrect):

def get_new_index(string, char_index):
    chars = 0
    for i, char in enumerate(string):
        if char != '-':
            chars += 1
        if char_index == chars:
            return i+1

Rewritten version:

import re

def get(st, char_index):
    chars = -1
    for i, char in enumerate(st):
        if char != '-':
            chars += 1
        if char_index == chars:
            return i

def test():
    st = '---------------LL---NE--HVKTHTEEK---PF-ICTVCR-KS----------'
    initial = re.sub('-', '', st)
    for i, char in enumerate(initial):
        print i, char, st[get_1_indexed(st, i)]

def get_1_indexed(st, char_index):
    return 1 + get(st, char_index - 1)

def test_1_indexed():
    st = '---------------LL---NE--HVKTHTEEK---PF-ICTVCR-KS----------'
    initial = re.sub('-', '', st)
    for i, char in enumerate(initial):
        print i+1, char, st[get_1_indexed(st, i + 1) - 1]