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v2 (from flpo veky and myself): Party(Named, set), Friends(str) with lambda show_invite solution in Clear category for Party Invitations by Phil15
class Named:
def __init__(self, name): self.name = name
class Party(Named, set):
add_friend, del_friend = set.add, set.remove
def send_invites(self, date):
for friend in self: friend.invite = f"{self.name}: {date}"
class Friend(str):
show_invite = lambda self: getattr(self, 'invite', 'No party...')
Aug. 19, 2018