core – Abstract Base Classes.

class data_extractor.core.SimpleExtractorMeta

Simple Extractor Meta Class.

class data_extractor.core.ComplexExtractorMeta(name: str, bases: Tuple[type], attr_dict: Dict[str, Any])

Complex Extractor Meta Class.

class data_extractor.core.AbstractSimpleExtractor(expr: str)

Abstract Simple Extractor Class.

Its metaclass is data_extractor.core.SimpleExtractorMeta

Parameters:

expr (str) – Extractor selector expression.

abstract extract(element: Any) → Any

Extract data or subelement from element.

Parameters:

element (Any) – The target data node element.

Returns:

Data or subelement.

Return type:

Any

Raises:

ExprError – Extractor Expression Error.

extract_first(element: Any, default: Any = sentinel) → Any

Extract the first data or subelement from extract method call result.

Parameters:

• element (Any) – The target data node element.

• default (Any, optional) – Default value when not found. Default: data_extractor.utils.sentinel.

Returns:

Data or subelement.

Return type:

Any

Raises:

ExtractError – Thrown by extractor extracting wrong data.

class data_extractor.core.AbstractComplexExtractor

Abstract Complex Extractor Clase.

Its metaclass is data_extractor.core.ComplexExtractorMeta

abstract extract(element: Any) → Any

Extract the wanted data.

Parameters:

element (Any) – The target data node element.

Returns:

Data or subelement.

Return type:

Any

Raises:

ExtractError – Thrown by extractor extracting wrong data.