python 枚举

from enum import IntEnum

class StatusE(IntEnum):
    """
    定义一个枚举
    """
    OPEN = 1
    IN_PROGRESS = 2
    CLOSED = 3

def handle_open_status():
    print('Handling openstatus')

def handle_in_progress_status():
    print('Handling inprogress status')

def handle_closed_status():
    print('Handling closedstatus')

handlers = {
    StatusE.OPEN.value: handle_open_status,
    StatusE.IN_PROGRESS.value: handle_in_progress_status,
    StatusE.CLOSED.value: handle_closed_status
}

def handle_status_change(status):
    if status not in handlers:
         raise Exception(f'No handler found for status: {status}')
    handler = handlers[status]
    handler()


if __name__ == "__main__":
    print(StatusE.OPEN.value)
    print(handlers)

    handle_status_change(StatusE.OPEN.value)  # Handling open status
    handle_status_change(StatusE.IN_PROGRESS.value)  # Handling in progress status
    handle_status_change(StatusE.CLOSED.value)  # Handling closed status
    # handle_status_change(4)  #Will raise the exception