Click with optional arguments which are enum type.

demo.py

# Standard Library
import enum

# Third Party Library
import click


class Order(enum.Enum):
    latest = "latest"
    oldest = "oldest"


class Predicate(enum.Enum):
    is_video = "is_video"
    is_images = "is_images"


def parse_enum_option(enum_cls):
    def callback(ctx, param, value):
        return enum_cls[value]

    return callback


def ClickEnumType(enum_cls):
    return click.Choice([e.name for e in enum_cls])


@click.command()
@click.option(
    "-o",
    "--order",
    default="latest",  # or Order.latest.name
    type=ClickEnumType(Order),
    callback=parse_enum_option(Order),
)
@click.option(
    "-p",
    "--predicate",
    default="is_video",  # or Predicate.is_video.name
    type=ClickEnumType(Predicate),
    callback=parse_enum_option(Predicate),
)
def query(order: Order, predicate: Predicate):
    print(order, predicate)


if __name__ == "__main__":
    query()

output.txt

$ python demo.py --help
Usage: demo.py [OPTIONS]

Options:
  -o, --order [latest|oldest]
  -p, --predicate [is_video|is_images]
  --help                          Show this message and exit.

$ python demo.py
Order.latest Predicate.is_video