class_docstr: Pattern for a mutable list-like object shareable via a shared
  memory block.  It differs from the built-in list type in that these
  lists can not change their overall length (i.e. no append, insert,
  etc.)
  
  Because values are packed into a memoryview as bytes, the struct
  packing format for any storable value must require no more than 8
  characters to describe its format.
class_docstr_tok: ["Pattern","for","a","mutable","list-like","object","shareable","via","a","shared","memory","block",".","It","differs","from","the","built-in","list","type","in","that","these","lists","can","not","change","their","overall","length","(","i.e",".","no","append",",","insert",",","etc",".",")","Because","values","are","packed","into","a","memoryview","as","bytes",",","the","struct","packing","format","for","any","storable","value","must","require","no","more","than","8","characters","to","describe","its","format","."]
code: def _offset_packing_formats(self):
      return self._offset_data_start + self._allocated_offsets[-1]
  
imports: from functools import partial
  import mmap
  import os
  import errno
  import struct
  import secrets
  import types
  from .None import resource_tracker
label_desc: Use image node_id 16 for calling the ShareableList obj's underlying member method code with example usage: obj._offset_packing_formats() and returns: unknown