zoo.py

from datetime import datetime
from models import Person

class Zoo:
    def __init__(zoo_config):
        self._owner_name = zoo_config["owner"]
        # 1. owner appears to be mandatory, it is actually the owner's name
        self._free_entrance_day = zoo_confi.get("free_entrance_day", "Monday")
        # 2. free_entrance_day is not mandatory, it must be the english name
        # for a week day, can I set it to None in zoo_config or will this 
        # cause a problem later?
        ...

    ...

    def owner(self):
      return Person.query.filter(Person.name == self._owner_name).one_or_none()
      # 3. aha, this line will raise an error if I use the wrong letter case or
      # trailing spaces for the owner
    
    def is_entrance_free(self):
      today = datetime.today().strftime('%A')
      return today == self._free_entrance_day
      # 4. aha, the entrance_day must be in the strftime format %A

   ...