| # 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 | |
| ) | |