rmarc
A pymarc-compatible MARC21 record library with a Rust core for high performance, roughly 2x faster.
This is a fork of pymarc. Significant use of LLMs to write the Rust speedups. License is the same MIT.
Installing and Using
Install from PyPI
pip install rmarc
For faster JSON and XML processing, install the optional fast backends:
pip install "rmarc[fast]" # orjson (JSON) + lxml (XML)
pip install "rmarc[fast-json]" # orjson only
pip install "rmarc[fast-xml]" # lxml only
When these libraries are installed, rmarc uses them automatically — no code
changes needed. If they are not installed, rmarc falls back to stdlib json
and xml.etree/xml.sax.
Basic usage
from rmarc import MARCReader, MARCWriter, Record, Field, Indicators, Subfield
# Read a MARC file
with open("records.mrc", "rb") as fh:
for record in MARCReader(fh):
print(record.title)
# Write a MARC file
with open("out.mrc", "wb") as fh:
writer = MARCWriter(fh)
writer.write(record)
writer.close()
JSON (MARC-in-JSON)
from rmarc import JSONReader, JSONWriter
# Read
with open("records.json") as fh:
for record in JSONReader(fh):
print(record.title)
# Write
with open("out.json", "w") as fh:
writer = JSONWriter(fh)
for record in records:
writer.write(record)
writer.close()
# Serialise a single record
json_str = record.as_json()
record_dict = record.as_dict()
XML (MARCXML)
from rmarc import XMLWriter
from rmarc.marcxml import parse_xml_to_array, map_xml, record_to_xml
# Parse a MARCXML file
records = parse_xml_to_array("records.xml")
# Stream-process without loading everything into memory
def handle(record):
print(record.title)
map_xml(handle, "records.xml")
# Serialise a record to XML bytes
xml_bytes = record_to_xml(record)
xml_bytes_with_ns = record_to_xml(record, namespace=True)
# Write a MARCXML collection
with open("out.xml", "wb") as fh:
writer = XMLWriter(fh)
for record in records:
writer.write(record)
writer.close()
Performance
rmarc is a drop-in replacement for pymarc with critical paths implemented in Rust via PyO3. Pure Python fallbacks are included for platforms where the Rust extension can't be built.
Benchmarks (vs pure Python baseline)
Measured on the same machine, same test data, same API. The "baseline" column is rmarc with Rust disabled (pure Python, equivalent to pymarc performance).
| Benchmark | Baseline | Rustified | Speedup |
|---|---|---|---|
| Decode single record | 239 us | 39 us | 6.1x |
| Round-trip (decode + encode) | 258 us | 62 us | 4.2x |
| Read + iterate 10 records | 1,795 us | 413 us | 4.3x |
| MARC-8 to Unicode (1515 lines) | 13,714 us | 1,349 us | 10.2x |
| Read + iterate 1,000 records | 266,589 us | 51,000 us | 5.2x |
| Bulk read 100,000 records | 18,337 ms | 4,279 ms | 4.3x |
Fast JSON and XML backends
Installing rmarc[fast] enables additional acceleration for JSON and XML
operations. The speedups below are measured against the stdlib-only path.
JSON (pip install "rmarc[fast-json]" — uses orjson)
| Operation | stdlib | orjson | Speedup |
|---|---|---|---|
| JSON decode (batch) | ~30 us | ~6 us | ~5x |
record.as_json() |
~9 us | ~5 us | ~2x |
JSONWriter.write() |
~9 us | ~5 us | ~2x |
orjson is a Rust-backed JSON library. It is used transparently whenever
installed. If a JSON document contains MARC control characters that orjson
rejects (technically invalid JSON but tolerated by some tools), rmarc
automatically retries with stdlib json so nothing breaks.
XML (pip install "rmarc[fast-xml]" — uses lxml)
| Operation | stdlib SAX/ET | lxml | Speedup |
|---|---|---|---|
parse_xml_to_array() |
~270 us | ~67 us | ~4x |
record_to_xml() |
~110 us | ~80 us | ~1.4x |
XMLWriter.write() (batch) |
~600 us | ~500 us | ~1.2x |
lxml uses the libxml2 C library for parsing. parse_xml is reimplemented
using lxml.sax.saxify so the existing XmlHandler subclass API is unchanged.
record_to_xml_node and record_to_xml use lxml.etree as a drop-in
replacement for xml.etree.ElementTree.
What's in Rust
- Binary MARC21 codec (
decode_marc_raw,encode_marc_raw) — parses record bytes, splits directory entries, extracts fields/subfields, and handles UTF-8 and MARC-8 encoding conversion all in one Rust call. - MARC-8 to Unicode converter (
marc8_to_unicode_rs) — stateful byte-level conversion with escape-sequence codeset switching, multibyte CJK support, combining character reordering, and NFC normalization. Uses compile-time perfect hash maps (phf) for the 12 MARC-8 character sets.
What stays in Python
- Field/Record/Subfield object construction (the API layer)
- XML parsing/serialization — accelerated by lxml when installed
- JSON handling — accelerated by orjson when installed
- Convenience properties (title, isbn, author, etc.)
- Unknown encodings (cp1251, etc.) — returned as raw bytes for Python's codec system
1 maintainer
Metadata
1 maintainer
Release files for rmarc 5.3.1
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Source distribution (sdist)
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| rmarc-5.3.1.tar.gz | 915.6 kB | Details |
Built distributions (wheels)
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