Module `prometheus_alert_model.utils`

Expand source code

# Copyright © 2020 Tim Schwenke <tim.and.trallnag+code@gmail.com>
# Licensed under Apache License 2.0 <http://www.apache.org/licenses/LICENSE-2.0>

from typing import Dict, List


def intersect(list_of_dcts: List[Dict[str, str]]) -> Dict[str, str]:
    """Calculates the key-value intersection of a list of dictionaries.

    Args:
        list_of_dcts (List[Dict[str, str]]): List of dictionaries to intersect.
            Will not be mutated.

    Returns:
        Dict[str, str]: A new dictionary that contains the intersection of all
            key-value combinations. Meaning all key-values that occur in very
            single dictionary in the given list. If the given list is empty,
            an empty `dict` will be returned. If the given list contains only
            one `dict`, this `dict` will be copied and returned.
    """

    if len(list_of_dcts) == 0:
        return {}
    elif len(list_of_dcts) == 1:
        return list_of_dcts[0].copy()

    list_of_sets = [set(dct.items()) for dct in list_of_dcts]

    intersection_set = list_of_sets[0].intersection(*list_of_sets[1:])

    return dict(intersection_set)

Functions

def intersect(list_of_dcts: List[Dict[str, str]]) ‑> Dict[str, str]

Calculates the key-value intersection of a list of dictionaries.

Args

list_of_dcts : List[Dict[str, str]]: List of dictionaries to intersect. Will not be mutated.

Returns

Dict[str, str]: A new dictionary that contains the intersection of all key-value combinations. Meaning all key-values that occur in very single dictionary in the given list. If the given list is empty, an empty dict will be returned. If the given list contains only one dict, this dict will be copied and returned.

Expand source code

def intersect(list_of_dcts: List[Dict[str, str]]) -> Dict[str, str]:
    """Calculates the key-value intersection of a list of dictionaries.

    Args:
        list_of_dcts (List[Dict[str, str]]): List of dictionaries to intersect.
            Will not be mutated.

    Returns:
        Dict[str, str]: A new dictionary that contains the intersection of all
            key-value combinations. Meaning all key-values that occur in very
            single dictionary in the given list. If the given list is empty,
            an empty `dict` will be returned. If the given list contains only
            one `dict`, this `dict` will be copied and returned.
    """

    if len(list_of_dcts) == 0:
        return {}
    elif len(list_of_dcts) == 1:
        return list_of_dcts[0].copy()

    list_of_sets = [set(dct.items()) for dct in list_of_dcts]

    intersection_set = list_of_sets[0].intersection(*list_of_sets[1:])

    return dict(intersection_set)