ak.contents.ListArray ===================== Defined in `awkward.contents.listarray `__ on `line 55 `__. .. py:class:: ak.contents.ListArray(starts, stops, content, *, parameters=None) ListArray generalizes :py:obj:`ak.contents.ListOffsetArray` by not requiring its ``content`` to be in increasing order and by allowing it to have unreachable elements between lists. Instead of a single ``offsets`` buffer, ListArray has * ``starts``: The starting index of each list. * ``stops``: The stopping index of each list. :py:obj:`ak.contents.ListOffsetArray` ``offsets`` may be related to ``starts`` and ``stops`` by:: starts = offsets[:-1] stops = offsets[1:] ListArrays are a common by-product of structure manipulation: as a result of some operation, we might want to view slices or permutations of the ``content`` without copying it to make a contiguous version of it. For that reason, ListArrays are more useful in a data-manipulation library like Awkward Array than in a data-representation library like Apache Arrow. Like :py:obj:`ak.contents.ListOffsetArray` and :py:obj:`ak.contents.RegularArray`, a ListArray can represent strings if its ``__array__`` parameter is ``"string"`` (UTF-8 assumed) or ``"bytestring"`` (no encoding assumed) and it contains an :py:obj:`ak.contents.NumpyArray` of ``dtype=np.uint8`` whose ``__array__`` parameter is ``"char"`` (UTF-8 assumed) or ``"byte"`` (no encoding assumed). There is no equivalent of ListArray in Apache Arrow. To illustrate how the constructor arguments are interpreted, the following is a simplified implementation of ``__init__``, ``__len__``, and ``__getitem__``:: class ListArray(Content): def __init__(self, starts, stops, content): assert isinstance(starts, (Index32, IndexU32, Index64)) assert isinstance(stops, type(starts)) assert isinstance(content, Content) assert len(stops) >= len(starts) # usually equal for i in range(len(starts)): start = starts[i] stop = stops[i] if start != stop: assert start < stop # i.e. start <= stop assert start >= 0 assert stop <= len(content) self.starts = starts self.stops = stops self.content = content def __len__(self): return len(self.starts) def __getitem__(self, where): if isinstance(where, int): if where < 0: where += len(self) assert 0 <= where < len(self) return self.content[self.starts[where] : self.stops[where]] elif isinstance(where, slice) and where.step is None: starts = self.starts[where.start : where.stop] stops = self.stops[where.start : where.stop] return ListArray(starts, stops, self.content) elif isinstance(where, str): return ListArray(self.starts, self.stops, self.content[where]) else: raise AssertionError(where) .. py:attribute:: _starts .. py:attribute:: _stops .. py:attribute:: _content .. py:property:: starts :type: awkward.index.Index .. py:property:: stops :type: awkward.index.Index .. py:attribute:: form_cls :type: awkward._typing.Final .. py:method:: copy(starts=UNSET, stops=UNSET, content=UNSET, *, parameters=UNSET) .. py:method:: __copy__() .. py:method:: __deepcopy__(memo) .. py:method:: simplified(starts, stops, content, *, parameters=None) :classmethod: .. py:method:: _form_with_key(getkey: awkward._typing.Callable[[awkward.contents.content.Content], str | None]) -> awkward.forms.listform.ListForm .. py:method:: _form_with_key_path(path: awkward.forms.form.FormKeyPathT) -> awkward.forms.listform.ListForm .. py:method:: _to_buffers(form: awkward.forms.form.Form, getkey: awkward._typing.Callable[[awkward.contents.content.Content, awkward.forms.form.Form, str], str], container: collections.abc.MutableMapping[str, awkward._nplikes.array_like.ArrayLike], backend: awkward._backends.backend.Backend, byteorder: str) .. py:method:: _to_typetracer(forget_length: bool) -> awkward._typing.Self .. py:method:: _touch_data(recursive: bool) .. py:method:: _touch_shape(recursive: bool) .. py:property:: length :type: awkward._nplikes.shape.ShapeItem .. py:method:: __repr__() .. py:method:: _repr(indent, pre, post) .. py:method:: to_ListOffsetArray64(start_at_zero: bool = False) -> awkward.contents.listoffsetarray.ListOffsetArray .. py:method:: to_RegularArray() .. py:method:: _getitem_nothing() .. py:method:: _is_getitem_at_placeholder() -> bool .. py:method:: _is_getitem_at_virtual() -> bool .. py:method:: _getitem_at(where: awkward._nplikes.numpy_like.IndexType) .. py:method:: _getitem_range(start: awkward._nplikes.numpy_like.IndexType, stop: awkward._nplikes.numpy_like.IndexType) -> awkward.contents.content.Content .. py:method:: _getitem_field(where: str | awkward._typing.SupportsIndex, only_fields: tuple[str, Ellipsis] = ()) -> awkward.contents.content.Content .. py:method:: _getitem_fields(where: list[str | awkward._typing.SupportsIndex], only_fields: tuple[str, Ellipsis] = ()) -> awkward.contents.content.Content .. py:method:: _carry(carry: awkward.index.Index, allow_lazy: bool) -> awkward.contents.content.Content .. py:method:: _compact_offsets64(start_at_zero) .. py:method:: _broadcast_tooffsets64(offsets: awkward.index.Index) -> awkward.contents.listoffsetarray.ListOffsetArray .. py:method:: _getitem_next_jagged(slicestarts: awkward.index.Index, slicestops: awkward.index.Index, slicecontent: awkward.contents.content.Content, tail) -> awkward.contents.content.Content .. py:method:: _getitem_next(head: awkward._slicing.SliceItem | tuple, tail: tuple[awkward._slicing.SliceItem, Ellipsis], advanced: awkward.index.Index | None) -> awkward.contents.content.Content .. py:method:: _offsets_and_flattened(axis: int, depth: int) -> tuple[awkward.index.Index, awkward.contents.content.Content] .. py:method:: _mergeable_next(other: awkward.contents.content.Content, mergebool: bool, mergecastable: awkward._typing.Literal[same_kind, equiv, family]) -> bool .. py:method:: _mergemany(others: collections.abc.Sequence[awkward.contents.content.Content]) -> awkward.contents.content.Content .. py:method:: _fill_none(value: awkward.contents.content.Content) -> awkward.contents.content.Content .. py:method:: _local_index(axis, depth) .. py:method:: _numbers_to_type(name, including_unknown) .. py:method:: _is_unique(negaxis, starts, offsets, outlength) .. py:method:: _unique(negaxis, starts, offsets, outlength) .. py:method:: _argsort_next(negaxis, starts, shifts, offsets, outlength, ascending, stable) .. py:method:: _sort_next(negaxis, starts, offsets, outlength, ascending, stable) .. py:method:: _combinations(n, replacement, recordlookup, parameters, axis, depth) .. py:method:: _reduce_next(reducer, negaxis, starts, shifts, offsets, outlength, mask, keepdims, behavior) .. py:method:: _validity_error(path) .. py:method:: _nbytes_part() .. py:method:: _pad_none(target, axis, depth, clip) .. py:method:: _to_arrow(pyarrow: awkward._typing.Any, mask_node: awkward.contents.content.Content | None, validbytes: awkward.contents.content.Content | None, length: int, options: awkward.contents.content.ToArrowOptions) .. py:method:: _to_cudf(cudf: awkward._typing.Any, mask: awkward.contents.content.Content | None, length: int) .. py:method:: _to_backend_array(allow_missing, backend) .. py:method:: _remove_structure(backend: awkward._backends.backend.Backend, options: awkward.contents.content.RemoveStructureOptions) -> list[awkward.contents.content.Content] .. py:method:: _drop_none() -> awkward.contents.content.Content .. py:method:: _rebuild_without_nones(none_indexes, new_content) .. py:method:: _recursively_apply(action: awkward.contents.content.ImplementsApplyAction, depth: int, depth_context: collections.abc.Mapping[str, awkward._typing.Any] | None, lateral_context: collections.abc.Mapping[str, awkward._typing.Any] | None, options: awkward.contents.content.ApplyActionOptions) -> awkward.contents.content.Content | None .. py:method:: _to_packed(recursive: bool = True) -> awkward._typing.Self .. py:method:: _to_list(behavior, json_conversions) .. py:method:: _to_backend(backend: awkward._backends.backend.Backend) -> awkward._typing.Self .. py:method:: _materialize(type_) -> awkward._typing.Self .. py:property:: _is_all_materialized :type: bool .. py:property:: _is_any_materialized :type: bool .. py:method:: _is_equal_to(other: awkward._typing.Self, index_dtype: bool, numpyarray: bool, all_parameters: bool) -> bool