docstr: `b` can be any length
docstr_tok: ["`","b","`","can","be","any","length"]
code: def append(self, b: bytes):
      """`b` can be any length"""
      self._buffers.append(b)
      self._size += len(b)
  
file_path: hail/hail/python/hailtop/aiotools/utils.py
imports: from typing import Deque, TypeVar, AsyncIterator, Iterator
  import collections
  from contextlib import contextmanager
  import asyncio
label_desc: Use image node_id 2 for calling the WriteBuffer obj's underlying member method code with example usage: obj.append(b) without return types