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_nested_sequence.py

"""A module containing the `_NestedSequence` protocol."""

from __future__ import annotations

from collections.abc import Iterator
from typing import (
    Any,
    TypeVar,
    Protocol,
    runtime_checkable,
)

__all__ = ["_NestedSequence"]

_T_co = TypeVar("_T_co", covariant=True)

@runtime_checkable
class _NestedSequence(Protocol[_T_co]):
    """A protocol for representing nested sequences.

Warning
    -------
    `_NestedSequence` currently does not work in combination with typevars,
    *e.g.* ``def func(a: _NestedSequnce[T]) -> T: ...``.

See Also
    --------
    collections.abc.Sequence
        ABCs for read-only and mutable :term:`sequences`.

Examples
    --------
    .. code-block:: python

>>> from __future__ import annotations

>>> from typing import TYPE_CHECKING
        >>> import numpy as np
        >>> from numpy._typing import _NestedSequence

>>> def get_dtype(seq: _NestedSequence[float]) -> np.dtype[np.float64]:
        ...     return np.asarray(seq).dtype

>>> a = get_dtype([1.0])
        >>> b = get_dtype([[1.0]])
        >>> c = get_dtype([[[1.0]]])
        >>> d = get_dtype([[[[1.0]]]])

>>> if TYPE_CHECKING:
        ...     reveal_locals()
        ...     # note: Revealed local types are:
        ...     # note:     a: numpy.dtype[numpy.floating[numpy._typing._64Bit]]
        ...     # note:     b: numpy.dtype[numpy.floating[numpy._typing._64Bit]]
        ...     # note:     c: numpy.dtype[numpy.floating[numpy._typing._64Bit]]
        ...     # note:     d: numpy.dtype[numpy.floating[numpy._typing._64Bit]]

"""

def __len__(self, /) -> int:
        """Implement ``len(self)``."""
        raise NotImplementedError

def __getitem__(self, index: int, /) -> _T_co | _NestedSequence[_T_co]:
        """Implement ``self[x]``."""
        raise NotImplementedError

def __contains__(self, x: object, /) -> bool:
        """Implement ``x in self``."""
        raise NotImplementedError

def __iter__(self, /) -> Iterator[_T_co | _NestedSequence[_T_co]]:
        """Implement ``iter(self)``."""
        raise NotImplementedError

def __reversed__(self, /) -> Iterator[_T_co | _NestedSequence[_T_co]]:
        """Implement ``reversed(self)``."""
        raise NotImplementedError

def count(self, value: Any, /) -> int:
        """Return the number of occurrences of `value`."""
        raise NotImplementedError

def index(self, value: Any, /) -> int:
        """Return the first index of `value`."""
        raise NotImplementedError

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-01-07 04:51:44
..	dir	-	root/root	0755	2025-01-07 04:51:46
__pycache__	dir	-	root/root	0755	2025-01-07 04:51:44
__init__.py	text/plain	6.84 KB	root/root	0644	2025-01-06 04:11:07
_add_docstring.py	text/plain	3.83 KB	root/root	0644	2025-01-06 04:11:07
_array_like.py	text/x-python	4.2 KB	root/root	0644	2025-01-06 04:11:07
_callable.pyi	text/plain	10.86 KB	root/root	0644	2025-01-06 04:11:07
_char_codes.py	text/x-python	5.78 KB	root/root	0644	2025-01-06 04:11:07
_dtype_like.py	text/x-python	5.53 KB	root/root	0644	2025-01-06 04:11:07
_extended_precision.py	text/plain	777 B	root/root	0644	2025-01-06 04:11:07
_nbit.py	text/plain	345 B	root/root	0644	2025-01-06 04:11:07
_nested_sequence.py	text/plain	2.51 KB	root/root	0644	2025-01-06 04:11:07
_scalars.py	text/x-python	980 B	root/root	0644	2025-01-06 04:11:07
_shape.py	text/x-python	211 B	root/root	0644	2025-01-06 04:11:07
_ufunc.pyi	text/plain	12.34 KB	root/root	0644	2025-01-06 04:11:07
setup.py	text/plain	337 B	root/root	0644	2025-01-06 04:11:07