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"""

>>> import weakref

>>> stock = weakref.WeakValueDictionary()

>>> catalog = [Cheese('Red Leicester'), Cheese('Tilsit'),

... Cheese('Brie'), Cheese('Parmesan')]

...

>>> for cheese in catalog:

... stock[cheese.kind] = cheese

...

>>> sorted(stock.keys())

['Brie', 'Parmesan', 'Red Leicester', 'Tilsit']

>>> del catalog

>>> sorted(stock.keys())

['Parmesan']

>>> del cheese

>>> sorted(stock.keys())

[]

"""

# tag::CHEESE_CLASS[]

class Cheese:

def __init__(self, kind):

self.kind = kind

def __repr__(self):

return f'Cheese({self.kind!r})'

# end::CHEESE_CLASS[]