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Advanced usage
===============
Packer
------
autoreset
~~~~~~~~~
When you used ``autoreset=False`` option of :class:`~msgpack.Packer`,
``pack()`` method doesn't return packed ``bytes``.
You can use :meth:`~msgpack.Packer.bytes` or :meth:`~msgpack.Packer.getbuffer` to
get packed data.
``bytes()`` returns ``bytes`` object. ``getbuffer()`` returns some bytes-like
object. It's concrete type is implement detail and it will be changed in future
versions.
You can reduce temporary bytes object by using ``Unpacker.getbuffer()``.
.. code-block:: python
packer = Packer(use_bin_type=True, autoreset=False)
packer.pack([1, 2])
packer.pack([3, 4])
with open('data.bin', 'wb') as f:
f.write(packer.getbuffer())
packer.reset() # reset internal buffer
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