Enum for Python open() modes

from enum import Enum


class OpenMode(str, Enum):
    _binary = "b"
    _update = "+"

    read = "r"
    truncate_and_write = "w"
    exclusive_create = "x"
    append = "a"
    update = read + _update
    truncate_and_update = truncate_and_write + _update
    exclusive_create_and_update = exclusive_create + _update
    append_and_read = append + _update
    read_binary = read + _binary
    truncate_and_write_binary = truncate_and_write + _binary
    exclusive_create_binary = exclusive_create + _binary
    append_binary = append + _binary
    update_binary = update + _binary
    truncate_and_update_binary = truncate_and_update + _binary
    exclusive_create_and_update_binary = exclusive_create_and_update + _binary
    append_and_read_binary = append_and_read + _binary