parameters: (self, stream, begin, chunksize)
docstring: Constructor.
  
      Args:
        stream: (io.Base, file object), the stream to wrap.
        begin: int, the seek position the chunk begins at.
        chunksize: int, the size of the chunk.
docstring_summary: Constructor.
docstring_tokens: Constructor .
function: def __init__(self, stream, begin, chunksize):
      """Constructor.
  
      Args:
        stream: (io.Base, file object), the stream to wrap.
        begin: int, the seek position the chunk begins at.
        chunksize: int, the size of the chunk.
      """
      self._stream = stream
      self._begin = begin
      self._chunksize = chunksize
      self._stream.seek(begin)
function_tokens: def __init__ ( self , stream , begin , chunksize ) : self . _stream = stream self . _begin = begin self . _chunksize = chunksize self . _stream . seek ( begin )