lastra-convert 0.8.0

Python CLI to convert between Lastra and Parquet/CSV/Arrow. Mirror of QTSurfer/lastra-convert (Java).

Python CLI to convert between Lastra and Parquet / CSV / Arrow.
Mirror of the Java lastra-convert tool.

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Status

🚧 Pre-release — repository scaffold while we port the converter from Java. The first published release will be 0.8.0 to align with lastra-java.

Install (planned)

pip install lastra-convert

Usage (planned CLI)

# Lastra → Parquet
lastra2parquet ticks.lastra ticks.parquet

# Parquet → Lastra (auto-pick best codec per column)
parquet2lastra ticks.parquet ticks.lastra --best

# CSV → Lastra (with explicit schema)
csv2lastra ticks.csv ticks.lastra --schema "ts:long:delta_varint,close:double:alp"

# Lastra → Arrow IPC
lastra2arrow ticks.lastra ticks.arrow

Library API (planned)

from lastra_convert import lastra_to_parquet, parquet_to_lastra

lastra_to_parquet("ticks.lastra", "ticks.parquet")
parquet_to_lastra("ticks.parquet", "ticks.lastra", best=True)

Reference implementation

This package mirrors QTSurfer/lastra-convert (Java, JVM CLI). Output is byte-equivalent for the same input + codec choices.

License

Copyright 2026 Wualabs LTD. Apache License 2.0 — see LICENSE.