* fix(maths): use conventional datetime alias in Zeller's congruence

* from datetime import date

Replaced datetime module alias with direct import for clarity.

---------

Co-authored-by: Christian Clauss <[email protected]>

* refactor(heap): remove redundant TypeVar in Heap

* refactor(heap): revert Comparable.__gt__ signature to self: T, other: T

* Clean up imports in heap.py

Removed unused TypeVar import from heap.py

* Update __gt__ method signature in Comparable class

---------

Co-authored-by: Christian Clauss <[email protected]>

* feat(dynamic_programming): add weighted interval scheduling algorithm

* test(dynamic_programming): add doctest to __post_init__ and add test function

* Move weighted interval scheduling to scheduling directory

---------

Co-authored-by: Christian Clauss <[email protected]>

…heAlgorithms#15551)

* fix: parenthesize multi-catch that only parses on 3.14

PEP 758 syntax requires Python 3.14, but the script metadata declares
requires-python >= 3.13. Reported by ty check run per TheAlgorithms#15187.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update required Python version in instagram_crawler.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>

TheAlgorithms#15550)

* fix: parenthesize multi-catch that only parses on 3.14

PEP 758 syntax requires Python 3.14, but the script metadata declares
requires-python >= 3.11. Reported by ty check run per TheAlgorithms#15187.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix: declare 3.14 in crypto_price_tracker PEP 723 metadata

The unparenthesized multi-catch (PEP 758) only parses on 3.14+.
Parenthesizing is not an option: ruff-format 0.16.10 with the repo's
py315 target re-emits the parenthesized form, so pre-commit.ci reverts
it on every push. Align the declared minimum instead.

* fix: alias datetime import to dt in maths/zellers_congruence

Clears ICN001, which fails on master and blocks every PR ruff check.

* Refactor datetime import in zellers_congruence.py

Replaced 'datetime as dt' with 'datetime' for clarity.

* Update required Python version to 3.15

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>

- Implement is_keith_number(number: int) -> bool with rolling sum optimization
- Implement find_keith_numbers(limit: int) -> list[int]
- Add Wikipedia and OEIS reference links
- Comprehensive doctests covering normal, edge, and error cases

make_linked_list declared the input as Iterable[int] but tested emptiness
with truthiness, so an empty generator silently produced an empty
LinkedList instead of raising. Materialize the iterable first and cover
generator input with doctests.

Co-authored-by: Christian Clauss <[email protected]>

…ms#15533)

…ies (TheAlgorithms#15570)

Co-authored-by: Copilot <[email protected]>

…rithms#15572)

* Add scripts/find_and_fix_pep798.py to find and fix PEP 798 opportunities

Co-authored-by: Copilot <[email protected]>

* Python PEP 798 compression fixes

* updating DIRECTORY.md

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: cclauss <[email protected]>

…e rule (TheAlgorithms#15568)

Annotating @contextmanager functions as -> Iterator is deprecated in Python 3.15 typeshed stubs; updated to -> Generator[None]. Un-ignores rules.deprecated in pyproject.toml.

Contributes to TheAlgorithms#15187.

* Initial plan

* Filter PEP 798 scan paths

Co-authored-by: cclauss <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: cclauss <[email protected]>

…lysis (TheAlgorithms#15606)

In linear_discriminant_analysis, line 146 wrote if features.any: instead of calling if features.any():. Because the method object is always truthy, the else branch handling empty datasets was unreachable dead code, triggering ty warning[redundant-condition].

Call eatures.any() (matching line 107 in principal_component_analysis) and add a test case in test_linear_discriminant_analysis verifying that an empty dataset properly enters the else branch.

Validation:
- uvx ty check machine_learning/dimensionality_reduction.py -> All checks passed (0 diagnostics)
- uvx --with scipy --with scikit-learn --with numpy pytest machine_learning/dimensionality_reduction.py --doctest-modules -> 9 passed
- uvx ruff check / format -> clean

updates:
- [github.com/tox-dev/pyproject-fmt: v2.30.1 → v2.30.3](tox-dev/pyproject-fmt@v2.30.1...v2.30.3)
- [github.com/astral-sh/ruff-pre-commit: v0.16.10 → v0.17.3](astral-sh/ruff-pre-commit@v0.16.10...v0.17.3)
- [github.com/rvben/rumdl-pre-commit: v0.2.78 → v0.3.2](rvben/rumdl-pre-commit@v0.2.78...v0.3.2)
- [github.com/astral-sh/uv-pre-commit: 0.12.23 → 0.13.6](astral-sh/uv-pre-commit@0.12.23...0.13.6)
- [github.com/abravalheri/validate-pyproject: 0.26 → v0.27](abravalheri/validate-pyproject@0.26...v0.27)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>