tqec.plaquette.frozendefaultdict.FrozenDefaultDict

class FrozenDefaultDict(arg: Mapping[K, V] | Iterable[tuple[K, V]] | None = None, *, default_factory: Callable[[], V] | None = None)

A defaultdict implementation that cannot be mutated.

This class re-defines all the mutating methods of defaultdict (i.e., all the mutating methods of dict and __missing__) in order to make any instance immutable.

Note on re-defining __missing__:

The standard defaultdict implementation is entirely based on the __missing__ method (described here https://docs.python.org/3/library/collections.html#collections.defaultdict.__missing__) that is called when a user-provided key was not found in the defined keys. This __missing__ method try to use self.default_factory to create a new value and inserts that new value in the dictionary. That last part is problematic for Plaquettes and in particular to compare collections of Plaquettes through __hash__ and __eq__.

__init__(arg: Mapping[K, V] | Iterable[tuple[K, V]] | None = None, *, default_factory: Callable[[], V] | None = None) → None

Methods

__init__([arg, default_factory])
get(k[,d])
has_default_factory()
items()
keys()
map_keys(callable)
values()

Attributes

default_factory