mirror of
https://github.com/msgpack/msgpack-python.git
synced 2025-10-19 20:03:16 +00:00
33 lines
785 B
ReStructuredText
33 lines
785 B
ReStructuredText
|
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
|