First Non-Repeated Character (CodeEval) in Python 3.x

main.py

# coding=utf-8
import sys


def get_first_non_repeated_character(s):
    first_idx_of_non_repeated_character = list(map(lambda x: s.count(x), s)).index(1)
    return s[first_idx_of_non_repeated_character]


def main():
    with open(sys.argv[1], "r") as f:
        for line in f:
            print(get_first_non_repeated_character(line.rstrip()))


if __name__ == "__main__":
    main()