import os


CHUNK_SIZE = 1024

write_path = os.path.join(os.getcwd(), 'task2_data_1.txt')
read_path = os.path.join(os.getcwd(), 'task2_data_2.txt')

try:
    write_file = open(write_path, 'a')
    read_file = open(read_path)

except FileNotFoundError as e:
    exception_path = str(e).strip('[Errno 2] No such file or directory:')[1:-1]
    print(f'"{exception_path}" не существует')

except PermissionError as e:
    exception_path = str(e).strip('[Errno 13] Permission denied:')[1:-1]
    print(f'Файл "{exception_path}" не доступен для чтения/записи')

except IsADirectoryError as e:
    exception_path = str(e).strip('[Errno 21] Is a directory:')[1:-1]
    print(f'"{exception_path}" является директорией')

else:
    write_file.write('\n\n\n')

    data = read_file.read(CHUNK_SIZE)
    write_file.write(data)
    while data:
        data = read_file.read(CHUNK_SIZE)
        write_file.write(data)

    # пожалуйста не мучайте меня я не хочу писать еще три expept'a
    os.rename('task2_data_1.txt', 'task2_data_all.txt')
    os.remove('task2_data_2.txt')