dictionary_combinations.py

from itertools import combinations
from typing import Dict


def dictionary_combinations(d: Dict, min_keys=1, max_keys=None):
    """
    Produce all possible combinations of sub-dictionaries from a dictionary
    within a length range.
    >>> dictionary_combinations({'key1': 1, 'key2': 2, 'key3': 3})
    [{'key1': 1},
     {'key2': 2},
     {'key3': 3},
     {'key1': 1, 'key2': 2},
     {'key1': 1, 'key3': 3},
     {'key2': 2, 'key3': 3},
     {'key1': 1, 'key2': 2, 'key3': 3}]
    >>> dictionary_combinations({'key1': 1, 'key2': 2, 'key3': 3}, max_keys=2)
    [{'key1': 1},
     {'key2': 2},
     {'key3': 3},
     {'key1': 1, 'key2': 2},
     {'key1': 1, 'key3': 3},
     {'key2': 2, 'key3': 3}]
    """
    num_keys_range = range(min_keys, (max_keys if max_keys else len(d)) + 1)
    return [_d for l in num_keys_range for _d in map(dict, combinations(d.items(), l))]