Smart read and save

data = read("./users.csv")                        # → list[dict]
data = read("https://example.com/config.json")    # → dict (auto from Content-Type)
data = read("s3://bucket/data.parquet")           # → list[dict] (with cobra4[data])

save(data, "./users.parquet")
save(data, "s3://bucket/out.json")

Built-in handlers

Source	Output
*.csv (file or HTTP text/csv)	list[dict]
*.json (file or HTTP application/json)	dict or list
*.jsonl	list[Any]
*.txt, *.md, anything else local	str
*.parquet	list[dict] (cobra4[data])

Atomicity

save() is atomic: it writes to a temp file in the target's directory, fsyncs, then os.replace()s into place. A crash mid-write leaves either the old file or the new file — never a half-written one.

Adding your own

See Smart dispatch.