How to use the dungeonsheets.background.Background function in dungeonsheets

skill_proficiencies = ('arcana', 'history')
    languages = ("[choose one]", '[choose one]')
    features = (feats.Researcher,)


class Sailor(Background):
    name = "Sailor"
    skill_proficiencies = ('athletics', 'perception')
    features = (feats.ShipsPassage,)


class Pirate(Sailor):
    name = "Pirate"


class Soldier(Background):
    name = "Soldier"
    skill_proficiencies = ('athletics', 'intimidation')
    features = (feats.MilitaryRank,)


class Urchin(Background):
    name = "Urchin"
    skill_proficiencies = ('sleight of hand', 'stealth')
    features = (feats.CitySecrets,)


# Sword's Coast Adventurers Guide
class CityWatch(Background):
    name = "City Watch"
    skill_proficiencies = ('athletics', 'insight')
    languages = ('[choose one]', '[choose one]')

class Soldier(Background):
    name = "Soldier"
    skill_proficiencies = ('athletics', 'intimidation')
    features = (feats.MilitaryRank,)


class Urchin(Background):
    name = "Urchin"
    skill_proficiencies = ('sleight of hand', 'stealth')
    features = (feats.CitySecrets,)


# Sword's Coast Adventurers Guide
class CityWatch(Background):
    name = "City Watch"
    skill_proficiencies = ('athletics', 'insight')
    languages = ('[choose one]', '[choose one]')
    features = (feats.WatchersEye,)


class ClanCrafter(Background):
    name = "Clan Crafter"
    skill_proficiencies = ('history', 'insight')
    languages = ('Dwarvish',)
    features = (feats.RespectOfTheStoutFolk,)


class CloisteredScholar(Background):
    name = "Cloistered Scholar"
    skill_proficiencies = ('history',)

class Outlander(Background):
    name = "Outlander"
    skill_proficiencies = ('athletics', 'survival')
    languages = ("[choose one]", )
    features = (feats.Wanderer,)


class Sage(Background):
    name = "Sage"
    skill_proficiencies = ('arcana', 'history')
    languages = ("[choose one]", '[choose one]')
    features = (feats.Researcher,)


class Sailor(Background):
    name = "Sailor"
    skill_proficiencies = ('athletics', 'perception')
    features = (feats.ShipsPassage,)


class Pirate(Sailor):
    name = "Pirate"


class Soldier(Background):
    name = "Soldier"
    skill_proficiencies = ('athletics', 'intimidation')
    features = (feats.MilitaryRank,)


class Urchin(Background):

'history', 'intimidation', 'investigation',
                     'medicine', 'nature', 'perception', 'performance',
                     'persuasion', 'religion', 'survival')
    num_skill_choices = 1
    languages = ('[choose one]', '[choose one]')
    features = (feats.SafeHaven,)


class FarTraveler(Background):
    name = 'Far Traveler'
    skill_proficiencies = ('insight', 'perception')
    languages = ('[choose one]',)
    features = (feats.AllEyesOnYou,)


class Inheritor(Background):
    name = "Inheritor"
    skill_proficiencies = ('survival',)
    skill_choices = ('arcana', 'history', 'religion')
    num_skill_choices = 1
    languages = ('[choose one]',)
    features = (feats.Inheritance,)


class KnightOfTheOrder(Background):
    name = "Knight of the Order"
    skill_proficiencies = ('persuasion',)
    skill_choices = ('arcana', 'history', 'nature', 'religion')
    num_skill_choices = 1
    languages = ('[choose one]',)
    features = (feats.KnightlyRegard,)

class Spy(Criminal):
    name = "Spy"


class Entertainer(Background):
    name = "Entertainer"
    skill_proficiencies = ('acrobatics', 'performance')
    features = (feats.ByPopularDemand,)


class Gladiator(Entertainer):
    name = "Gladiator"


class FolkHero(Background):
    name = "Folk Hero"
    skill_proficiencies = ('animal handling', 'survival')
    features = (feats.RusticHospitality,)


class GuildArtisan(Background):
    name = "Guild Artisan"
    skill_proficiencies = ('insight', 'persuasion')
    languages = ("[choose one]", "[choose one]")
    features = (feats.GuildMembership,)


class GuildMerchant(GuildArtisan):
    name = "Guild Merchant"

name = "Sailor"
    skill_proficiencies = ('athletics', 'perception')
    features = (feats.ShipsPassage,)


class Pirate(Sailor):
    name = "Pirate"


class Soldier(Background):
    name = "Soldier"
    skill_proficiencies = ('athletics', 'intimidation')
    features = (feats.MilitaryRank,)


class Urchin(Background):
    name = "Urchin"
    skill_proficiencies = ('sleight of hand', 'stealth')
    features = (feats.CitySecrets,)


# Sword's Coast Adventurers Guide
class CityWatch(Background):
    name = "City Watch"
    skill_proficiencies = ('athletics', 'insight')
    languages = ('[choose one]', '[choose one]')
    features = (feats.WatchersEye,)


class ClanCrafter(Background):
    name = "Clan Crafter"
    skill_proficiencies = ('history', 'insight')

def background(self, bg):
        if isinstance(bg, background.Background):
            self._background = bg
            self._background.owner = self
        elif isinstance(bg, type) and issubclass(bg, background.Background):
            self._background = bg(owner=self)
        elif isinstance(bg, str):
            try:
                self._background = findattr(background, bg)(owner=self)
            except AttributeError:
                msg = (f'Background "{bg}" not defined. '
                       f'Please add it to ``background.py``')
                self._background = background.Background(owner=self)
                warnings.warn(msg)

features = (feats.CourtFunctionary,)


class FactionAgent(Background):
    name = "Faction Agent"
    skill_proficiencies = ('insight',)
    skill_choices = ('animal handling', 'arcana', 'deception',
                     'history', 'intimidation', 'investigation',
                     'medicine', 'nature', 'perception', 'performance',
                     'persuasion', 'religion', 'survival')
    num_skill_choices = 1
    languages = ('[choose one]', '[choose one]')
    features = (feats.SafeHaven,)


class FarTraveler(Background):
    name = 'Far Traveler'
    skill_proficiencies = ('insight', 'perception')
    languages = ('[choose one]',)
    features = (feats.AllEyesOnYou,)


class Inheritor(Background):
    name = "Inheritor"
    skill_proficiencies = ('survival',)
    skill_choices = ('arcana', 'history', 'religion')
    num_skill_choices = 1
    languages = ('[choose one]',)
    features = (feats.Inheritance,)


class KnightOfTheOrder(Background):

name = "Cloistered Scholar"
    skill_proficiencies = ('history',)
    skill_choices = ('arcana', 'nature', 'religion')
    num_skill_choices = 1
    languages = ('[choose one]', '[choose one]')
    features = (feats.LibraryAccess,)


class Courtier(Background):
    name = "Courtier"
    skill_proficiencies = ("insight", 'persuasion')
    languages = ('[choose one]', '[choose one]')
    features = (feats.CourtFunctionary,)


class FactionAgent(Background):
    name = "Faction Agent"
    skill_proficiencies = ('insight',)
    skill_choices = ('animal handling', 'arcana', 'deception',
                     'history', 'intimidation', 'investigation',
                     'medicine', 'nature', 'perception', 'performance',
                     'persuasion', 'religion', 'survival')
    num_skill_choices = 1
    languages = ('[choose one]', '[choose one]')
    features = (feats.SafeHaven,)


class FarTraveler(Background):
    name = 'Far Traveler'
    skill_proficiencies = ('insight', 'perception')
    languages = ('[choose one]',)
    features = (feats.AllEyesOnYou,)

class Acolyte(Background):
    name = "Acolyte"
    skill_proficiencies = ('insight', 'religion')
    languages = ("[choose one]", "[choose one]")
    features = (feats.ShelterOfTheFaithful,)


class Charlatan(Background):
    name = "Charlatan"
    skill_proficiencies = ('deception', 'sleight of hand')
    features = (feats.FalseIdentity,)


class Criminal(Background):
    name = "Criminal"
    skill_proficiencies = ('deception', 'stealth')
    features = (feats.CriminalContact,)


class Spy(Criminal):
    name = "Spy"


class Entertainer(Background):
    name = "Entertainer"
    skill_proficiencies = ('acrobatics', 'performance')
    features = (feats.ByPopularDemand,)


class Gladiator(Entertainer):