core
– Abstract Base Classes.¶
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class
data_extractor.core.
SimpleExtractorMeta
¶ Simple Extractor Meta Class.
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class
data_extractor.core.
ComplexExtractorMeta
(name: str, bases: Tuple[type], attr_dict: Dict[str, Any])¶ Complex Extractor Meta Class.
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class
data_extractor.core.
AbstractSimpleExtractor
(expr: str)¶ Abstract Simple Extractor Clase.
Its metaclass is
data_extractor.core.SimpleExtractorMeta
- Parameters
expr (str) – Extractor selector expression.
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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.
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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.
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class
data_extractor.core.
AbstractComplexExtractor
¶ Abstract Complex Extractor Clase.
Its metaclass is
data_extractor.core.ComplexExtractorMeta
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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.
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abstract