convert-genome 0.2.0

Python wrapper for SauersML/convert_genome (DTC → VCF/BCF/PLINK conversion).

convert_genome (Python)

Python wrapper for the SauersML/convert_genome CLI. Convert direct-to-consumer dumps (23andMe, AncestryDNA, MyHeritage, deCODEme) and standard VCF/BCF into compliant VCF, BCF, or PLINK 1.9 binary — with build detection, sex inference, liftover, and panel harmonisation, all controllable from kwargs.

from convert_genome import convert, OutputFormat

result = convert(
    input="23andme.txt",
    output="out.vcf",
    format=OutputFormat.VCF,
    assembly="hg38",
    standardize=True,
)

result.statistics.emitted_records       # int
result.sample.sex_inferred              # bool
result.build_detection.detected_build   # 'GRCh37' / 'GRCh38' / ...
result.report_path                      # path to <stem>_report.json
result.output_paths                     # files that actually exist on disk
result.yield_rate                       # emitted / total

The wrapper runs the Rust binary, parses the sidecar <stem>_report.json into typed frozen dataclasses, and returns a single ConversionResult.

Install

pip install convert_genome
# the Rust binary:
cargo install convert_genome

Binary located via binary= or PATH. No env-var indirection — if the binary isn't on PATH, pass binary= explicitly. Missing binary → ConvertGenomeBinaryNotFound with the suggested install command.

Shortcuts: skip every auto-discovery step

The CLI will download/auto-detect things it doesn't need to. Pass them in directly:

convert(
    input="raw.txt",
    output="out.vcf",
    reference="/cache/hg38.fa",         # skip FASTA download
    reference_fai="/cache/hg38.fa.fai", # skip .fai indexing
    input_build="hg19",                  # skip build detection
    assembly="GRCh38",                   # target build (still does liftover)
    panel="/cache/1kg_panel.vcf",        # supply harmonisation panel
    sex="female",                        # skip sex inference
    standardize=True,
)

sex is lenient: passing "unknown" or "indeterminate" (e.g. when chaining out of infer_sex) silently omits the --sex flag and lets the CLI run its own inference.

Builder

Converter is a frozen dataclass; every with_* returns a new instance, so branching is safe.

from convert_genome import Converter, Sex, OutputFormat

plan = (
    Converter(input="raw.txt", output_dir="out/", format=OutputFormat.PLINK)
        .with_assembly("GRCh38")
        .with_reference("/cache/hg38.fa", "/cache/hg38.fa.fai")
        .with_panel("/data/1kg_panel.vcf.gz")
        .with_standardize()
        .with_sex(Sex.MALE)
)

print(plan.argv())   # exact argv that would be passed to the CLI
result = plan.run()

Enums

InputFormat.AUTO / .DTC / .VCF / .BCF
OutputFormat.VCF / .BCF / .PLINK
Sex.MALE / .FEMALE
Assembly.GRCH37 / .GRCH38     # plus a `.parse()` classmethod that
                              # accepts 'hg19' / 'hg38' / 'build38' / ...

Output

The Rust tool writes <stem>_report.json alongside the main output. The wrapper loads it into ConversionResult, with sub-dataclasses for each section:

result.input         # InputInfo (path, format, origin)
result.output        # OutputInfo (path, format)
result.reference     # ReferenceInfo (path, origin, assembly)
result.panel         # PanelInfo | None
result.sample        # SampleInfo (id, sex, sex_inferred)
result.build_detection  # BuildDetection | None (detected_build, match rates)
result.statistics    # Statistics (total / emitted / variant / ... records)
result.report_path   # path to the JSON sidecar
result.output_paths  # tuple[Path] — files that actually exist on disk

For PLINK output, output_paths includes the .bed/.bim/.fam trio. For output_dir with a panel, it includes panel.vcf. Non-existent paths are filtered out automatically.

Errors

• ConvertGenomeBinaryNotFound — CLI not installed / not on PATH.
• InvalidConfig — argument combination rejected before launching (e.g. missing input file, conflicting output/output_dir).
• ConvertGenomeFailed — CLI exited non-zero. The exception carries stdout, stderr, returncode.
• ReportNotFound — CLI ran clean but didn't write a JSON sidecar.

All subclass ConvertGenomeError.