ak.contents.IndexedArray ======================== Defined in `awkward.contents.indexedarray `__ on `line 57 `__. .. py:class:: ak.contents.IndexedArray(index, content, *, parameters=None) IndexedArray is a general-purpose tool for *lazily* changing the order of and/or duplicating some ``content`` with a `np.take `__ over the integer buffer ``index``. It has many uses: * representing a lazily applied slice. * simulating pointers into another collection. * emulating the dictionary encoding of Apache Arrow and Parquet. If the ``__array__`` parameter is ``"categorical"``, the contents must be unique. Some operations are optimized (for instance, ``==`` only compares ``index`` integers) and the array can be converted to and from Arrow/Parquet's dictionary encoding. To illustrate how the constructor arguments are interpreted, the following is a simplified implementation of ``__init__``, ``__len__``, and ``__getitem__``:: class IndexedArray(Content): def __init__(self, index, content): assert isinstance(index, (Index32, IndexU32, Index64)) assert isinstance(content, Content) for x in index: assert 0 <= x < len(content) # index[i] must not be negative self.index = index self.content = content def __len__(self): return len(self.index) def __getitem__(self, where): if isinstance(where, int): if where < 0: where += len(self) assert 0 <= where < len(self) return self.content[self.index[where]] elif isinstance(where, slice) and where.step is None: return IndexedArray( self.index[where.start : where.stop], self.content ) elif isinstance(where, str): return IndexedArray(self.index, self.content[where]) else: raise AssertionError(where) .. py:attribute:: _index .. py:attribute:: _content .. py:property:: index .. py:attribute:: form_cls :type: awkward._typing.Final .. py:method:: copy(index=UNSET, content=UNSET, *, parameters=UNSET) .. py:method:: __copy__() .. py:method:: __deepcopy__(memo) .. py:method:: simplified(index, content, *, parameters=None) :classmethod: .. py:method:: _form_with_key(getkey: awkward._typing.Callable[[awkward.contents.content.Content], str | None]) -> awkward.forms.indexedform.IndexedForm .. py:method:: _form_with_key_path(path: awkward.forms.form.FormKeyPathT) -> awkward.forms.indexedform.IndexedForm .. 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_IndexedOptionArray64() -> awkward.contents.indexedoptionarray.IndexedOptionArray .. py:method:: mask_as_bool(valid_when: bool = True) -> awkward._nplikes.array_like.ArrayLike .. 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) -> IndexedArray .. py:method:: _getitem_next_jagged_generic(slicestarts, slicestops, slicecontent, tail) .. 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:: project(mask=None) .. 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:: _merging_strategy(others) .. py:method:: _reverse_merge(other) .. 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:: _unique_index(index, sorted=True) .. 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:: _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:: _push_inside_record_or_project() -> awkward._typing.Self | awkward.contents.RecordArray .. py:method:: _is_equal_to(other: awkward._typing.Self, index_dtype: bool, numpyarray: bool, all_parameters: bool) -> bool .. py:method:: _trim() -> awkward._typing.Self