Script to remove duplicate chars in strings with O(n) complexity for each string

Remove duplicate chars on strings script

#!/usr/bin/env python
import argparse

def remove_duplicated(ss, verbose=False):
    if verbose: print "initial " + ss
    s = [x for x in ss]
    duplicated = 0
    for i in range(1, len(s)):
        if s[i] == s[i-1]: duplicated += 1
        s[i-duplicated] = s[i]
    print "final " if verbose else "" + "".join(s[:len(s)-duplicated])

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--verbose', '-v',
            action='store_true',
            help='verbose flag')
    parser.add_argument('string', 
            help='string with duplicated characters',
            nargs='*')
    args = parser.parse_args()
    for s in args.strings:
        remove_duplicated(s, args.verbose)