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from typing import TYPE_CHECKING, Any, NoReturn, Union
try:
from types import NoneType, UnionType
UNION_TYPES = {UnionType, Union}
except ImportError:
UNION_TYPES = {Union}
NoneType = type(None) # type: ignore[misc]
class Frozendict(dict):
def _immutable_error(self, *_: Any, **__: Any) -> NoReturn:
msg = f"Unable to mutate {type(self).__name__}"
raise TypeError(msg)
# Override all mutation methods to prevent changes
if not TYPE_CHECKING:
__setitem__ = _immutable_error
__delitem__ = _immutable_error
clear = _immutable_error
pop = _immutable_error
popitem = _immutable_error
update = _immutable_error
def __hash__(self) -> int: # type: ignore[override]
return hash(tuple(self.items()))
__all__ = ("UNION_TYPES", "Frozendict", "NoneType")
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