Data (fynance.data)

Ingestion layer: file adapters into PriceSeries, alignment/resampling, and no-lookahead temporal splits.

load(path[, source])	Load a file into a PriceSeries (or mapping for multi-column).
CSVSource()	Read a CSV file into a PriceSeries (or a mapping).
ParquetSource()	Read a Parquet file into a PriceSeries (or a mapping).
align(series[, how, fill])	Align several series onto a common index.
resample(ps, freq[, agg])	Downsample a series to a coarser frequency.
train_test_split(n, test_size[, gap])	Time-ordered train/test index split.
walk_forward(n, train, test[, step, purge])	Generate purged walk-forward windows.

Custom sources

The registry extension API: subclass BaseDataSource, register it under a file extension, and load (or get_source) will dispatch to it.

BaseDataSource()	Abstract base for data-source adapters (the I/O port).
register(name)	Class decorator registering a data-source adapter under name.
get_source(name)	Instantiate a registered data source by name.