NOTE:
json-stream-rs-tokenizeris now automatically used byjson-stream, so unless you find a bug, you can ignore this package's existence!
json-stream-rs-tokenizer
A faster tokenizer for the json-stream Python library.
It's actually just json-stream's own tokenizer (itself adapted from the
NAYA project) ported to Rust almost
verbatim and made available as a Python module using
PyO3.
On my machine, it speeds up parsing by a factor of 4–10, depending on the nature of the data.
Installation
Implicit
Starting at its 2.0 release, json-stream depends on and uses
json-stream-rs-tokenizer by default, so you don't need to install it
explicitly anymore.
Explicit
If you use an older json-stream version (which you have no reason to do) or
need to install json-stream-rs-tokenizer explicitly for another reason, you
can do:
pip install json-stream-rs-tokenizer
The library will be installed as a prebuilt wheel if one is available for your platform. Otherwise, pip will try to build it from the source distribution, which requires a Rust toolchain to be installed and available to succeed.
Note that if the build from source fails, the package installation will be
considered successfully completed anyway, but RustTokenizer (see below) won't
be available for import. This is so that packages (specifically, json-stream)
can depend on the library but fall back to their own implementation if neither
a prebuilt wheel is available nor the build succeeds.
You can increase the installation command's verbosity with -v (repeated for
even more information, e.g. -vv) to see error messages when the build from
source fails.
Note that if the Rust library is compiled in debug mode, it will run
slower than the pure-Python tokenizer. The setuptools configuration should
make sure this doesn't happen even when installing in development mode, but
when in doubt, run installation commands with -v to see the Rust compilation
commands and verify that they used --release.
Usage
Implicit
As described above, json-stream-rs-tokenizer is now used by json-stream by
default, so you don't have to do anything special to use it. json-stream will
fall back to its pure-Python tokenizer when json-stream-rs-tokenizer was not
successfully installed, however.
Explicit
For older versions of json-stream, or if you want to ensure the Rust
tokenizer is used no matter what, simply pass this package's RustTokenizer as
the tokenizer argument to json-stream's load or visit:
from io import StringIO
from json_stream import load
from json_stream_rs_tokenizer import RustTokenizer
json_buf = StringIO('{ "a": [1,2,3,4], "b": [5,6,7] }')
# uses the Rust tokenizer to load JSON:
d = load(json_buf, tokenizer=RustTokenizer)
for k, l in d.items():
print(f"{k}: {' '.join(str(n) for n in l)}")
Note that the import of RustTokenizer will fail if the Rust extension is not
available (i.e., when no prebuilt wheels were available and the installation
from the source distribution failed).
Limitations
- For PyPy, the speedup is only 1.0-1.5x (much lower than that for CPython). This has yet to be investigated.
- In builds that don't support PyO3's
num-bigintextension (currently only PyPy builds and manual ones against Python's limited C API (Py_LIMITED_API)), conversion of large integers is performed in Python rather than in Rust, at a very small runtime cost.
Benchmarks
The package comes with a script for rudimentary benchmarks on randomly
generated JSON data. To run it, you'll need to install the optional benchmark
dependencies:
pip install 'json-stream-rs-tokenizer[benchmark]'
You can then run the benchmark as follows:
python -m json_stream_rs_tokenizer.benchmark
Run it with --help to see more information.
Tests
To run the tests, you'll need to install the optional test dependencies:
pip install 'json-stream-rs-tokenizer[test]'
As the test dependencies depend on the benchmark dependencies but the feature enabling such "recursive optional dependencies" was only introduced in Pip 21.3, you'll need a version of Pip at least as recent as that. For older versions, just install the test dependencies manually.
License
The project's code itself is provided under the MIT license. Refer to the LICENSE file for details. The library binaries shipped in Python wheels have 3rd party dependencies compiled in under different, but similarly permissive licenses. Refer to LICENSES-RUST-DEPS.html (dependency crates) and LICENSES-RUST.html (Rust itself, stdlib etc.) for more information.
Changelog
Refer to the CHANGELOG.md file.
1 maintainer
Metadata
1 maintainer
Release files for json-stream-rs-tokenizer 0.5.4
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