Tidying Up My Python Libraries

t61codec 3.0.0

t61codec is a Python codec for T.61 strings. You still run into those in ASN.1 data, where they are called TeletexString. Version 3.0.0 follows the 1988 version of the ITU-T spec to the letter. Accented letters decode to precomposed characters, invalid input raises an error instead of being guessed, and the incremental decoder copes with sequences that are split across chunks.

The expected test data was written from the spec, not from the code. I also compared the output with glibc's iconv over 1696 inputs. All 168 differences are intended and documented.

This is the last feature release. From now on it only gets fixes.

x690 2.0.0

x690 is the BER encoder and decoder behind puresnmp. 2.0.0 is a breaking release:

• It uses t61codec 3, so T.61 decoding is strict now.
• Context tags are registered per type instead of globally.
• More types decode to proper Python values (str, datetime, float).
• A decoded value can let go of the input it came from.

puresnmp and NXP's spsdk both pin x690 <2, so they keep working as before until they move to it.

It also got a lot faster. Reading items of a decoded sequence by index was quadratic: 200 items took 40,200 header reads. Now it's at most 600. Decoding a file of 80 MB (on a Ryzen 5 5600X):

For whole documents, x690 is now the fastest of the five libraries I benchmarked. pyasn1 needs 146 s and 9.5 GB for the same file. For streaming, asn1crypto is still faster.

config_resolver 5.2.0

5.2.0 is the last release of config_resolver. With the alternatives around today, I don't see much value in keeping it.

It now emits a deprecation warning, and the docs have a migration page with tested replacements: pydantic-settings for services, ConfigParser for existing INI files, and platformdirs with tomllib for CLI tools. The repository is archived.

gouge 2.3.0

gouge fixes coloured tracebacks (some viewers lost the colour after the first line) and adds JSON output and an option to show extra record attributes, like a trace ID. The default output is byte-identical to 2.2.5, so existing setups don't change.

Docs and Python Support

The docs are now on GitHub Pages:

• https://exhuma.github.io/t61codec/
• https://exhuma.github.io/x690/
• https://exhuma.github.io/gouge/
• https://exhuma.github.io/config_resolver/

All four are tested against every supported CPython version, and releases go out through PyPI's Trusted Publishing.