Object of type Scoreboard is not JSON serializable

[snippsat]

Look at jsonpickle.
A quick example and i have removed getter/setter which in not popular or not needed for simple simple attribute access.
For more advance attribute access that return a value can use @property.

import jsonpickle

class GameEntry:
  """Represents one entry of a list of high scores."""
  def __init__(self, name, score):
    """Create an entry with given name and score."""
    self.name = name
    self.score = score

  def __str__(self):
    """Return string representation of the entry."""
    return f'({self.name}, {self.score})' # e.g., '(Bob, 98)'

obj = GameEntry('Bob', 98)
frozen = jsonpickle.encode(obj)

# To disk
with open('score.json', 'w') as j_out:
    print(frozen, file=j_out)

# From disk
with open('score.json') as j:
    frozen_obj = jsonpickle.decode(j.read())

Test frozen_obj:

>>> frozen_obj.name
'Bob'
>>> frozen_obj.score
98

>>> print(frozen_obj)
(Bob, 98)