class Character():
  def __init__(self, name):
     self.name = name
     self.affection = 1

sam = Character("Sam")
lulu = Character("Lulu")

npc_dictionary = {"Sam": sam, "Lulu": lulu}

print(npc_dictionary["Sam"].affection) # prints 1
npc_dictionary["Sam"].affection = 10

print(npc_dictionary["Sam"].affection) # prints 10