diff options
Diffstat (limited to 'src/pip/_internal/resolution/resolvelib/found_candidates.py')
| -rw-r--r-- | src/pip/_internal/resolution/resolvelib/found_candidates.py | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/src/pip/_internal/resolution/resolvelib/found_candidates.py b/src/pip/_internal/resolution/resolvelib/found_candidates.py index d2fa5ef55..8663097b4 100644 --- a/src/pip/_internal/resolution/resolvelib/found_candidates.py +++ b/src/pip/_internal/resolution/resolvelib/found_candidates.py @@ -9,15 +9,30 @@ something. """ import functools -from typing import Callable, Iterator, Optional, Set, Tuple +from collections.abc import Sequence +from typing import TYPE_CHECKING, Any, Callable, Iterator, Optional, Set, Tuple from pip._vendor.packaging.version import _BaseVersion -from pip._vendor.six.moves import collections_abc # type: ignore from .base import Candidate IndexCandidateInfo = Tuple[_BaseVersion, Callable[[], Optional[Candidate]]] +if TYPE_CHECKING: + SequenceCandidate = Sequence[Candidate] +else: + # For compatibility: Python before 3.9 does not support using [] on the + # Sequence class. + # + # >>> from collections.abc import Sequence + # >>> Sequence[str] + # Traceback (most recent call last): + # File "<stdin>", line 1, in <module> + # TypeError: 'ABCMeta' object is not subscriptable + # + # TODO: Remove this block after dropping Python 3.8 support. + SequenceCandidate = Sequence + def _iter_built(infos: Iterator[IndexCandidateInfo]) -> Iterator[Candidate]: """Iterator for ``FoundCandidates``. @@ -90,7 +105,7 @@ def _iter_built_with_inserted( yield installed -class FoundCandidates(collections_abc.Sequence): +class FoundCandidates(SequenceCandidate): """A lazy sequence to provide candidates to the resolver. The intended usage is to return this from `find_matches()` so the resolver @@ -111,7 +126,7 @@ class FoundCandidates(collections_abc.Sequence): self._prefers_installed = prefers_installed self._incompatible_ids = incompatible_ids - def __getitem__(self, index: int) -> Candidate: + def __getitem__(self, index: Any) -> Any: # Implemented to satisfy the ABC check. This is not needed by the # resolver, and should not be used by the provider either (for # performance reasons). @@ -138,5 +153,3 @@ class FoundCandidates(collections_abc.Sequence): if self._prefers_installed and self._installed: return True return any(self) - - __nonzero__ = __bool__ # XXX: Python 2. |