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from __future__ import annotations
from collections.abc import Callable, Sequence
from functools import partial
from inspect import getmro, isclass
from typing import TYPE_CHECKING, Generic, Type, TypeVar, cast, overload
_BaseExceptionT_co = TypeVar("_BaseExceptionT_co", bound=BaseException, covariant=True)
_BaseExceptionT = TypeVar("_BaseExceptionT", bound=BaseException)
_ExceptionT_co = TypeVar("_ExceptionT_co", bound=Exception, covariant=True)
_ExceptionT = TypeVar("_ExceptionT", bound=Exception)
# using typing.Self would require a typing_extensions dependency on py<3.11
_ExceptionGroupSelf = TypeVar("_ExceptionGroupSelf", bound="ExceptionGroup")
_BaseExceptionGroupSelf = TypeVar("_BaseExceptionGroupSelf", bound="BaseExceptionGroup")
def check_direct_subclass(
exc: BaseException, parents: tuple[type[BaseException]]
) -> bool:
for cls in getmro(exc.__class__)[:-1]:
if cls in parents:
return True
return False
def get_condition_filter(
condition: type[_BaseExceptionT]
| tuple[type[_BaseExceptionT], ...]
| Callable[[_BaseExceptionT_co], bool],
) -> Callable[[_BaseExceptionT_co], bool]:
if isclass(condition) and issubclass(
cast(Type[BaseException], condition), BaseException
):
return partial(check_direct_subclass, parents=(condition,))
elif isinstance(condition, tuple):
if all(isclass(x) and issubclass(x, BaseException) for x in condition):
return partial(check_direct_subclass, parents=condition)
elif callable(condition):
return cast("Callable[[BaseException], bool]", condition)
raise TypeError("expected a function, exception type or tuple of exception types")
def _derive_and_copy_attributes(self, excs):
eg = self.derive(excs)
eg.__cause__ = self.__cause__
eg.__context__ = self.__context__
eg.__traceback__ = self.__traceback__
if hasattr(self, "__notes__"):
# Create a new list so that add_note() only affects one exceptiongroup
eg.__notes__ = list(self.__notes__)
return eg
class BaseExceptionGroup(BaseException, Generic[_BaseExceptionT_co]):
"""A combination of multiple unrelated exceptions."""
def __new__(
cls: type[_BaseExceptionGroupSelf],
__message: str,
__exceptions: Sequence[_BaseExceptionT_co],
) -> _BaseExceptionGroupSelf:
if not isinstance(__message, str):
raise TypeError(f"argument 1 must be str, not {type(__message)}")
if not isinstance(__exceptions, Sequence):
raise TypeError("second argument (exceptions) must be a sequence")
if not __exceptions:
raise ValueError(
"second argument (exceptions) must be a non-empty sequence"
)
for i, exc in enumerate(__exceptions):
if not isinstance(exc, BaseException):
raise ValueError(
f"Item {i} of second argument (exceptions) is not an exception"
)
if cls is BaseExceptionGroup:
if all(isinstance(exc, Exception) for exc in __exceptions):
cls = ExceptionGroup
if issubclass(cls, Exception):
for exc in __exceptions:
if not isinstance(exc, Exception):
if cls is ExceptionGroup:
raise TypeError(
"Cannot nest BaseExceptions in an ExceptionGroup"
)
else:
raise TypeError(
f"Cannot nest BaseExceptions in {cls.__name__!r}"
)
instance = super().__new__(cls, __message, __exceptions)
instance._message = __message
instance._exceptions = __exceptions
return instance
def add_note(self, note: str) -> None:
if not isinstance(note, str):
raise TypeError(
f"Expected a string, got note={note!r} (type {type(note).__name__})"
)
if not hasattr(self, "__notes__"):
self.__notes__: list[str] = []
self.__notes__.append(note)
@property
def message(self) -> str:
return self._message
@property
def exceptions(
self,
) -> tuple[_BaseExceptionT_co | BaseExceptionGroup[_BaseExceptionT_co], ...]:
return tuple(self._exceptions)
@overload
def subgroup(
self, __condition: type[_ExceptionT] | tuple[type[_ExceptionT], ...]
) -> ExceptionGroup[_ExceptionT] | None: ...
@overload
def subgroup(
self, __condition: type[_BaseExceptionT] | tuple[type[_BaseExceptionT], ...]
) -> BaseExceptionGroup[_BaseExceptionT] | None: ...
@overload
def subgroup(
self,
__condition: Callable[[_BaseExceptionT_co | _BaseExceptionGroupSelf], bool],
) -> BaseExceptionGroup[_BaseExceptionT_co] | None: ...
def subgroup(
self,
__condition: type[_BaseExceptionT]
| tuple[type[_BaseExceptionT], ...]
| Callable[[_BaseExceptionT_co | _BaseExceptionGroupSelf], bool],
) -> BaseExceptionGroup[_BaseExceptionT] | None:
condition = get_condition_filter(__condition)
modified = False
if condition(self):
return self
exceptions: list[BaseException] = []
for exc in self.exceptions:
if isinstance(exc, BaseExceptionGroup):
subgroup = exc.subgroup(__condition)
if subgroup is not None:
exceptions.append(subgroup)
if subgroup is not exc:
modified = True
elif condition(exc):
exceptions.append(exc)
else:
modified = True
if not modified:
return self
elif exceptions:
group = _derive_and_copy_attributes(self, exceptions)
return group
else:
return None
@overload
def split(
self, __condition: type[_ExceptionT] | tuple[type[_ExceptionT], ...]
) -> tuple[
ExceptionGroup[_ExceptionT] | None,
BaseExceptionGroup[_BaseExceptionT_co] | None,
]: ...
@overload
def split(
self, __condition: type[_BaseExceptionT] | tuple[type[_BaseExceptionT], ...]
) -> tuple[
BaseExceptionGroup[_BaseExceptionT] | None,
BaseExceptionGroup[_BaseExceptionT_co] | None,
]: ...
@overload
def split(
self,
__condition: Callable[[_BaseExceptionT_co | _BaseExceptionGroupSelf], bool],
) -> tuple[
BaseExceptionGroup[_BaseExceptionT_co] | None,
BaseExceptionGroup[_BaseExceptionT_co] | None,
]: ...
def split(
self,
__condition: type[_BaseExceptionT]
| tuple[type[_BaseExceptionT], ...]
| Callable[[_BaseExceptionT_co], bool],
) -> (
tuple[
ExceptionGroup[_ExceptionT] | None,
BaseExceptionGroup[_BaseExceptionT_co] | None,
]
| tuple[
BaseExceptionGroup[_BaseExceptionT] | None,
BaseExceptionGroup[_BaseExceptionT_co] | None,
]
| tuple[
BaseExceptionGroup[_BaseExceptionT_co] | None,
BaseExceptionGroup[_BaseExceptionT_co] | None,
]
):
condition = get_condition_filter(__condition)
if condition(self):
return self, None
matching_exceptions: list[BaseException] = []
nonmatching_exceptions: list[BaseException] = []
for exc in self.exceptions:
if isinstance(exc, BaseExceptionGroup):
matching, nonmatching = exc.split(condition)
if matching is not None:
matching_exceptions.append(matching)
if nonmatching is not None:
nonmatching_exceptions.append(nonmatching)
elif condition(exc):
matching_exceptions.append(exc)
else:
nonmatching_exceptions.append(exc)
matching_group: _BaseExceptionGroupSelf | None = None
if matching_exceptions:
matching_group = _derive_and_copy_attributes(self, matching_exceptions)
nonmatching_group: _BaseExceptionGroupSelf | None = None
if nonmatching_exceptions:
nonmatching_group = _derive_and_copy_attributes(
self, nonmatching_exceptions
)
return matching_group, nonmatching_group
@overload
def derive(self, __excs: Sequence[_ExceptionT]) -> ExceptionGroup[_ExceptionT]: ...
@overload
def derive(
self, __excs: Sequence[_BaseExceptionT]
) -> BaseExceptionGroup[_BaseExceptionT]: ...
def derive(
self, __excs: Sequence[_BaseExceptionT]
) -> BaseExceptionGroup[_BaseExceptionT]:
return BaseExceptionGroup(self.message, __excs)
def __str__(self) -> str:
suffix = "" if len(self._exceptions) == 1 else "s"
return f"{self.message} ({len(self._exceptions)} sub-exception{suffix})"
def __repr__(self) -> str:
return f"{self.__class__.__name__}({self.message!r}, {self._exceptions!r})"
class ExceptionGroup(BaseExceptionGroup[_ExceptionT_co], Exception):
def __new__(
cls: type[_ExceptionGroupSelf],
__message: str,
__exceptions: Sequence[_ExceptionT_co],
) -> _ExceptionGroupSelf:
return super().__new__(cls, __message, __exceptions)
if TYPE_CHECKING:
@property
def exceptions(
self,
) -> tuple[_ExceptionT_co | ExceptionGroup[_ExceptionT_co], ...]: ...
@overload # type: ignore[override]
def subgroup(
self, __condition: type[_ExceptionT] | tuple[type[_ExceptionT], ...]
) -> ExceptionGroup[_ExceptionT] | None: ...
@overload
def subgroup(
self, __condition: Callable[[_ExceptionT_co | _ExceptionGroupSelf], bool]
) -> ExceptionGroup[_ExceptionT_co] | None: ...
def subgroup(
self,
__condition: type[_ExceptionT]
| tuple[type[_ExceptionT], ...]
| Callable[[_ExceptionT_co], bool],
) -> ExceptionGroup[_ExceptionT] | None:
return super().subgroup(__condition)
@overload
def split(
self, __condition: type[_ExceptionT] | tuple[type[_ExceptionT], ...]
) -> tuple[
ExceptionGroup[_ExceptionT] | None, ExceptionGroup[_ExceptionT_co] | None
]: ...
@overload
def split(
self, __condition: Callable[[_ExceptionT_co | _ExceptionGroupSelf], bool]
) -> tuple[
ExceptionGroup[_ExceptionT_co] | None, ExceptionGroup[_ExceptionT_co] | None
]: ...
def split(
self: _ExceptionGroupSelf,
__condition: type[_ExceptionT]
| tuple[type[_ExceptionT], ...]
| Callable[[_ExceptionT_co], bool],
) -> tuple[
ExceptionGroup[_ExceptionT_co] | None, ExceptionGroup[_ExceptionT_co] | None
]:
return super().split(__condition)
|