Оставляем только уникальные строки

uniq.py

import sys
import os

def extract_unique_lines(input_file):
    seen = set()
    unique_lines = []
    total_lines = 0

    with open(input_file, 'r', encoding='utf-8') as f:
        for line in f:
            total_lines += 1
            original = line.rstrip('\n').strip()
            normalized = original.lower()
            if normalized not in seen:
                seen.add(normalized)
                unique_lines.append(original)

    return total_lines, unique_lines

def write_unique_lines(output_file, lines):
    with open(output_file, 'w', encoding='utf-8') as f:
        for line in lines:
            f.write(line + '\n')

def main():
    if len(sys.argv) != 2:
        print("Использование: python uniq.py input.txt")
        sys.exit(1)

    input_path = sys.argv[1]
    if not os.path.isfile(input_path):
        print(f"Файл не найден: {input_path}")
        sys.exit(1)

    base_name = os.path.basename(input_path)
    name, ext = os.path.splitext(base_name)
    output_path = f"uniq_{name}{ext}"

    total_lines, unique_lines = extract_unique_lines(input_path)
    write_unique_lines(output_path, unique_lines)

    print(f"Было строк: {total_lines}")
    print(f"Стало строк: {len(unique_lines)}")
    print(f"Уникальные строки записаны в файл: {output_path}")

if __name__ == "__main__":
    main()

python3 uniq.py minus-kondei.txt