This script prints words that are still words when rot13 is applied.

palin13.py

from unidecode import unidecode
import codecs


def rot13(mot):
    return codecs.encode(mot, 'rot_13')


def string_set_from_file(file_path, encoding="utf-8"):
    try:
        file = open(file_path, "r", encoding=encoding)
    except FileNotFoundError:
        print("File not found")
        sys.exit(1)

    no_accents_strings = set()

    for line in file:
        line = line.rstrip("\n")  # Delete the \n at the end of the line
        no_accents_strings.add(unidecode(line).lower())  # remove accents and convert to lowercase
    file.close()

    return no_accents_strings


def palin13(all_words):
    valid_rotated_words = set()

    # Add the palindromes to the set
    [valid_rotated_words.add(current_word) for current_word in all_words if
     rot13(current_word) in all_words and rot13(current_word) not in valid_rotated_words]  # do not add duplicates

    return valid_rotated_words


if __name__ == '__main__':
    import sys

    path = input("Enter the file path: ") if len(sys.argv) < 2 else sys.argv[1]

    res = palin13(string_set_from_file(path))
    # Print the result
    print([(word, rot13(word)) for word in res])