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21 lines
896 B
Python
21 lines
896 B
Python
from operator import itemgetter
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from typing import Sequence, Optional, Callable, Tuple
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def extract_properties_to_lists(
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key_names: Sequence[str],
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data: Sequence[dict],
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extract_func: Optional[Callable[[dict], Tuple]] = None,
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) -> dict:
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"""
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Given a list of dictionaries and names of dictionary keys
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builds a dictionary with the requested keys and values lists
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:param key_names: names of the keys in the resulting dictionary
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:param data: sequence of dictionaries to extract values from
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:param extract_func: the optional callable that extracts properties
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from a dictionary and put them in a tuple in the order corresponding to
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key_names. If not specified then properties are extracted according to key_names
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"""
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value_sequences = zip(*map(extract_func or itemgetter(*key_names), data))
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return dict(zip(key_names, map(list, value_sequences)))
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