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EDITING: stash.py

from typing import Any
from typing import cast
from typing import Dict
from typing import Generic
from typing import TypeVar
from typing import Union

__all__ = ["Stash", "StashKey"]

T = TypeVar("T")
D = TypeVar("D")

class StashKey(Generic[T]):
    """``StashKey`` is an object used as a key to a :class:`Stash`.

A ``StashKey`` is associated with the type ``T`` of the value of the key.

A ``StashKey`` is unique and cannot conflict with another key.
    """

__slots__ = ()

class Stash:
    r"""``Stash`` is a type-safe heterogeneous mutable mapping that
    allows keys and value types to be defined separately from
    where it (the ``Stash``) is created.

Usually you will be given an object which has a ``Stash``, for example
    :class:`~pytest.Config` or a :class:`~_pytest.nodes.Node`:

.. code-block:: python

stash: Stash = some_object.stash

If a module or plugin wants to store data in this ``Stash``, it creates
    :class:`StashKey`\s for its keys (at the module level):

.. code-block:: python

# At the top-level of the module
        some_str_key = StashKey[str]()
        some_bool_key = StashKey[bool]()

To store information:

.. code-block:: python

# Value type must match the key.
        stash[some_str_key] = "value"
        stash[some_bool_key] = True

To retrieve the information:

.. code-block:: python

# The static type of some_str is str.
        some_str = stash[some_str_key]
        # The static type of some_bool is bool.
        some_bool = stash[some_bool_key]
    """

__slots__ = ("_storage",)

def __init__(self) -> None:
        self._storage: Dict[StashKey[Any], object] = {}

def __setitem__(self, key: StashKey[T], value: T) -> None:
        """Set a value for key."""
        self._storage[key] = value

def __getitem__(self, key: StashKey[T]) -> T:
        """Get the value for key.

Raises ``KeyError`` if the key wasn't set before.
        """
        return cast(T, self._storage[key])

def get(self, key: StashKey[T], default: D) -> Union[T, D]:
        """Get the value for key, or return default if the key wasn't set
        before."""
        try:
            return self[key]
        except KeyError:
            return default

def setdefault(self, key: StashKey[T], default: T) -> T:
        """Return the value of key if already set, otherwise set the value
        of key to default and return default."""
        try:
            return self[key]
        except KeyError:
            self[key] = default
            return default

def __delitem__(self, key: StashKey[T]) -> None:
        """Delete the value for key.

Raises ``KeyError`` if the key wasn't set before.
        """
        del self._storage[key]

def __contains__(self, key: StashKey[T]) -> bool:
        """Return whether key was set."""
        return key in self._storage

def __len__(self) -> int:
        """Return how many items exist in the stash."""
        return len(self._storage)