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71687cf | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | # Copyright (C) 2012 Anaconda, Inc
# SPDX-License-Identifier: BSD-3-Clause
"""Replacements for parts of the toolz library."""
from __future__ import annotations
import collections
import itertools
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from collections.abc import Generator, Sequence
from typing import Any
def groupby_to_dict(keyfunc, sequence):
"""A `toolz`-style groupby implementation.
Returns a dictionary of { key: [group] } instead of iterators.
"""
result = collections.defaultdict(list)
for key, group in itertools.groupby(sequence, keyfunc):
result[key].extend(group)
return dict(result)
def unique(sequence: Sequence[Any]) -> Generator[Any, None, None]:
"""A `toolz` inspired `unique` implementation.
Returns a generator of unique elements in the sequence
"""
seen: set[Any] = set()
yield from (
# seen.add always returns None so we will always return element
seen.add(element) or element
for element in sequence
# only pass along novel elements
if element not in seen
)
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