gistfile1.py

import json
from collections import OrderedDict


def sort_names():
	with open("some_file.txt", "+") as f:
		full_names = [line for line in f.readlines()]
		result = "\n".join(full_names.sorted(full_names, key=lambda x: x.split()[-1]))
		f.write(result)




def count_characters(characters):
	order = OrderedDict()
	for char in characters:
		if char in order:
			order[char] += 1
		else:
			order[char] = 1

	final_list = []
	for char, count in order.items():
		if count == 1:
			final_list.append(char)

	return "".join(final_list)



def test_char_counter(characters="a<@guia<@de00000"):
	assert count_characters(characters) == "guide"


if __name__ == "__main__":
	test_char_counter()