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Advanced usage

Packer

autoreset

When you used autoreset=False option of ~msgpack.Packer, pack() method doesn't return packed bytes.

You can use ~msgpack.Packer.bytes or ~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().

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