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""" |
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Utilities for filtering sequences. |
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""" |
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from itertools import product, chain |
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from operator import attrgetter, itemgetter |
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from typing import Dict, Generator, List, Tuple |
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8
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9
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10
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class AttributeFilter: |
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""" |
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Filter a sequence of objects/namedtuples by on attribute value predicates. |
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Parameters |
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---------- |
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keys: group of attribute keys to use as filter set. |
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predicates: values of attribute set to use in filtering. |
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""" |
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slots = ('keys', 'predicates', 'indexer') |
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def __init__(self, keys: Tuple[str], predicates: List[Tuple]): |
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self.keys = keys |
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self.predicates = set(predicates) |
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self.indexer = attrgetter(*keys) |
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def including(self, sequence) -> Generator: |
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"""Include the sequence elements matching the filter set.""" |
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return (element for element in sequence |
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if self.indexer(element) in self.predicates) |
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def excluding(self, sequence) -> Generator: |
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"""Exclude the sequence elements matching the filter set.""" |
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return (element for element in sequence |
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if self.indexer(element) not in self.predicates) |
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def create_key_filter(properties: Dict[str, list]) -> List[Tuple]: |
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"""Generate combinations of key, value pairs for each key in properties. |
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Examples |
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-------- |
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properties = {'ent': ['geo_rev', 'supply_chain'], 'own', 'fi'} |
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>> create_key_filter(properties) |
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--> [('ent', 'geo_rev'), ('ent', 'supply_chain'), ('own', 'fi')] |
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""" |
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combinations = (product([k], v) for k, v in properties.items()) |
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return chain.from_iterable(combinations) |
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def create_indexer(indexes: list): |
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"""Create indexer function to pluck values from list.""" |
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if len(indexes) == 1: |
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index = indexes[0] |
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return lambda x: (x[index],) |
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else: |
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return itemgetter(*indexes) |
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61
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portfoliome /
foil
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