Python · Intermediate · 35 min

Separate valid events from bad input

Validate an ingestion batch without losing the evidence for rejected rows.

Task

Implement parse_events(lines). Each input line should be a JSON object containing id and timestamp. Return accepted objects and a list of errors with one-based line numbers.

Requirements

lines must be a list of strings; otherwise raise ValueError.
A valid event has a nonempty string id and an integer timestamp (not bool). Negative timestamps are allowed.
Use error codes invalid_json for malformed JSON and invalid_event for a valid JSON value with the wrong shape or fields.
Keep valid objects and their extra fields in input order. Return {"events": [...], "errors": [{"line": n, "code": ...}]}. Do not deduplicate valid messages in this parser.

Data qualityJSON parsingQuarantine

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