ProtoCache Python

The Python binding is a format-compatible convenience layer for ProtoCache. Generated modules describe a schema, while the shared native runtime fully serializes and deserializes normal Python object graphs. It supports CPython 3.10 through 3.14. Release wheels target Linux x86_64, Windows AMD64, and macOS arm64.

The API favors a concise Python object model and format compatibility. Unlike the C++ binding, it is not a zero-copy view over the input buffer.

Installation

Install the release from PyPI:

python -m pip install protocache

Release wheels include the native extension and do not require a compiler. To install directly from a repository checkout instead:

python -m pip install ./python

The package contains a C++17 extension. Building from source therefore requires a supported Python development environment and a C++ compiler.

Generate Python schema classes with the ProtoCache protoc plugin:

protoc --pcpy_out=. test.proto

Usage

import protocache as pc
import test_pc

# Deserialization fully materializes nested messages, containers, strings, and
# bytes before returning.
root = test_pc.Main.Deserialize(data)
print(root.i32)
for item in root.objectv:
    print(item.str)

# Serialization walks the generated schema and produces ProtoCache bytes.
built = test_pc.Main(i32=1, str="hello", i32v=[1, 2])
encoded = built.Serialize()

packed = pc.compress(encoded)
assert pc.decompress(packed) == encoded

Generated message classes inherit from protocache.Message. Standalone repeated containers inherit from protocache.Array, and standalone maps inherit from protocache.Map. Ordinary repeated fields and maps accept normal list and dict values.

The distribution includes a py.typed marker and public type stubs, so mypy and other PEP 561-aware type checkers can type-check Message, Array, Map, and the compression helpers.

Development and packaging

Build the extension in place and run the tests from the repository root:

cd python
python setup.py build_ext --inplace
cd ..
python -m unittest discover -s test -p '*_test.py'
python python/smoke_test.py
python -m mypy --strict python/typing_check.py
python -m mypy.stubtest protocache

Build the source and wheel distributions with the standard PEP 517 frontend:

cd python
python -m pip install build
python -m build

The source distribution carries the C++ core files required to build the extension without a Git checkout. During a checkout build those files are staged temporarily from the repository's canonical src/ and include/ directories, then removed automatically; no second maintained copy is kept in the Python package.

Design notes

Generated *_pc.py files contain field numbers and lightweight type metadata. Message schemas are 6-tuples: (name, field_id, repeated, key_kind, value_kind, value_type).
Standalone repeated and map containers use a 3-tuple schema: (key_kind, value_kind, value_type). key_kind is protocache.NONE when no map key is present.
Deserialize() recursively materializes values; Serialize() reflects over the same schema tuples to emit compatible ProtoCache bytes.
Serialization uses Python's recursion checks; cyclic object graphs raise RecursionError. Native serialization allocation failures raise MemoryError.
compress() and decompress() are thin bindings over the C++ helpers and accept bytes-like inputs.
The binding does not bridge Python protobuf message classes. Interchange is through ProtoCache bytes.

ProtoCache is distributed under the repository's BSD 3-Clause license.

Metadata

Release files for protocache 1.2.6

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for protocache 1.2.6
File	Size	Uploaded
protocache-1.2.6.tar.gz	37.2 kB	Oct 11, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for protocache 1.2.6
File	Interpreter	ABI	Platform	Reset
protocache-1.2.6-cp314-cp314-win_amd64.whl 44.3 kB Oct 11, 2026	CPython 3.14	CPython 3.14	Windows x86-64	Details
protocache-1.2.6-cp314-cp314-musllinux_1_2_x86_64.whl 1.5 MB Oct 11, 2026	CPython 3.14	CPython 3.14	Linux musl 1.2+ x86-64	Details
protocache-1.2.6-cp314-cp314-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 449.9 kB Oct 11, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64	Details
protocache-1.2.6-cp314-cp314-macosx_11_0_arm64.whl 51.7 kB Oct 11, 2026	CPython 3.14	CPython 3.14	macOS 11.0+ ARM64	Details
protocache-1.2.6-cp313-cp313-win_amd64.whl 43.2 kB Oct 11, 2026	CPython 3.13	CPython 3.13	Windows x86-64	Details
protocache-1.2.6-cp313-cp313-musllinux_1_2_x86_64.whl 1.5 MB Oct 11, 2026	CPython 3.13	CPython 3.13	Linux musl 1.2+ x86-64	Details
protocache-1.2.6-cp313-cp313-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 450.2 kB Oct 11, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64	Details
protocache-1.2.6-cp313-cp313-macosx_11_0_arm64.whl 51.7 kB Oct 11, 2026	CPython 3.13	CPython 3.13	macOS 11.0+ ARM64	Details
protocache-1.2.6-cp312-cp312-win_amd64.whl 43.1 kB Oct 11, 2026	CPython 3.12	CPython 3.12	Windows x86-64	Details
protocache-1.2.6-cp312-cp312-musllinux_1_2_x86_64.whl 1.5 MB Oct 11, 2026	CPython 3.12	CPython 3.12	Linux musl 1.2+ x86-64	Details
protocache-1.2.6-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 450.2 kB Oct 11, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64	Details
protocache-1.2.6-cp312-cp312-macosx_11_0_arm64.whl 51.7 kB Oct 11, 2026	CPython 3.12	CPython 3.12	macOS 11.0+ ARM64	Details
protocache-1.2.6-cp311-cp311-win_amd64.whl 42.8 kB Oct 11, 2026	CPython 3.11	CPython 3.11	Windows x86-64	Details
protocache-1.2.6-cp311-cp311-musllinux_1_2_x86_64.whl 1.5 MB Oct 11, 2026	CPython 3.11	CPython 3.11	Linux musl 1.2+ x86-64	Details
protocache-1.2.6-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 448.3 kB Oct 11, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64	Details
protocache-1.2.6-cp311-cp311-macosx_11_0_arm64.whl 51.6 kB Oct 11, 2026	CPython 3.11	CPython 3.11	macOS 11.0+ ARM64	Details
protocache-1.2.6-cp310-cp310-win_amd64.whl 42.9 kB Oct 11, 2026	CPython 3.10	CPython 3.10	Windows x86-64	Details
protocache-1.2.6-cp310-cp310-musllinux_1_2_x86_64.whl 1.5 MB Oct 11, 2026	CPython 3.10	CPython 3.10	Linux musl 1.2+ x86-64	Details
protocache-1.2.6-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 445.1 kB Oct 11, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64	Details
protocache-1.2.6-cp310-cp310-macosx_11_0_arm64.whl 51.6 kB Oct 11, 2026	CPython 3.10	CPython 3.10	macOS 11.0+ ARM64	Details

Total release size: 10.1 MB

Release files / protocache-1.2.6.tar.gz

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Release files / protocache-1.2.6-cp313-cp313-win_amd64.whl

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Release files / protocache-1.2.6-cp313-cp313-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl

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Release files / protocache-1.2.6-cp312-cp312-macosx_11_0_arm64.whl

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Release files / protocache-1.2.6-cp311-cp311-macosx_11_0_arm64.whl

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Release files / protocache-1.2.6-cp310-cp310-musllinux_1_2_x86_64.whl

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Release files / protocache-1.2.6-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl

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Release files / protocache-1.2.6-cp310-cp310-macosx_11_0_arm64.whl

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Release history Release notifications | RSS feed

This release

1.2.6 This release

Oct 11, 2026 21 release files

1.2.1

Jul 28, 2026 21 release files

1.2.0

Jul 28, 2026 21 release files

protocache 1.2.6

ProtoCache Python

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