rohitg00/ai-engineering-from-scratch · error · SchemaError

{path}: expected {schema['type']}, got {type(value).__name__

Error message

{path}: expected {schema['type']}, got {type(value).__name__}

What it means

Error "{path}: expected {schema['type']}, got {type(value).__name__}" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/14-agent-engineering/34-repo-memory-and-state/code/main.py:78

def _check_type(value: Any, types: str | list[str]) -> bool:
    type_list = [types] if isinstance(types, str) else types
    for t in type_list:
        if t == "object" and isinstance(value, dict):
            return True
        if t == "array" and isinstance(value, list):
            return True
        if t == "string" and isinstance(value, str):
            return True
        if t == "integer" and isinstance(value, int) and not isinstance(value, bool):
            return True
        if t == "null" and value is None:
            return True
    return False


def validate(value: Any, schema: dict[str, Any], path: str = "$") -> None:
    if "type" in schema and not _check_type(value, schema["type"]):
        raise SchemaError(f"{path}: expected {schema['type']}, got {type(value).__name__}")
    if "enum" in schema and value not in schema["enum"]:
        raise SchemaError(f"{path}: {value!r} not in {schema['enum']}")
    if "pattern" in schema and isinstance(value, str) and not re.match(schema["pattern"], value):
        raise SchemaError(f"{path}: {value!r} does not match /{schema['pattern']}/")
    if isinstance(value, dict):
        for key in schema.get("required", []):
            if key not in value:
                raise SchemaError(f"{path}: missing required field {key!r}")
        properties = schema.get("properties", {})
        unexpected = sorted(set(value.keys()) - set(properties.keys()))
        if unexpected:
            raise SchemaError(f"{path}: unexpected fields {unexpected}")
        for key, sub in properties.items():
            if key in value:
                validate(value[key], sub, f"{path}.{key}")
    if isinstance(value, list) and "items" in schema:
        for idx, item in enumerate(value):
            validate(item, schema["items"], f"{path}[{idx}]")

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/14-agent-engineering/34-repo-memory-and-state/code/main.py:78 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/f303784ed0866aca. Report an issue: GitHub.