class_docstr: Provides accessor methods for a specific block.
  
  Ideally, we wouldn't need a separate accessor classes for blocks. However,
  this is needed if we want to support storing ``pyarrow.Table`` directly
  as a top-level Ray object, without a wrapping class (issue #17186).
class_docstr_tok: ["Provides","accessor","methods","for","a","specific","block",".","Ideally",",","we","would","n't","need","a","separate","accessor","classes","for","blocks",".","However",",","this","is","needed","if","we","want","to","support","storing","``","pyarrow.Table","``","directly","as","a","top-level","Ray","object",",","without","a","wrapping","class","(","issue","#","17186",")","."]
docstr: Return a slice of this block.
  
  Args:
      start: The starting index of the slice.
      end: The ending index of the slice.
      copy: Whether to perform a data copy for the slice.
  
  Returns:
      The sliced block result.
docstr_tok: ["Return","a","slice","of","this","block",".","Args",":","start",":","The","starting","index","of","the","slice",".","end",":","The","ending","index","of","the","slice",".","copy",":","Whether","to","perform","a","data","copy","for","the","slice",".","Returns",":","The","sliced","block","result","."]
code: def slice(self, start: int, end: int, copy: bool) -> Block:
      """Return a slice of this block.
  
      Args:
          start: The starting index of the slice.
          end: The ending index of the slice.
          copy: Whether to perform a data copy for the slice.
  
      Returns:
          The sliced block result.
      """
      raise NotImplementedError
  
imports: import collections
  import os
  import time
  from dataclasses import dataclass
  from typing import TYPE_CHECKING, Callable, Dict, Iterator, List, Literal, Optional, Protocol, Tuple, TypeVar, Union
  import numpy
  import ray
  from ray import DynamicObjectRefGenerator
  from ray.data._internal.util import _check_pyarrow_version, _truncated_repr
  from ray.types import ObjectRef
  from ray.util.annotations import DeveloperAPI
  import psutil
label_desc: Use image node_id 3 for calling the BlockAccessor obj's underlying member method code with example usage: obj.slice(start, end, copy) without return types