From 1d30fd93e2b18b10c75638bfd27811244371d2f2 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Wed, 15 Dec 2021 22:49:18 +0000
Subject: wip2: hopefully better now?

---
 utils.py | 46 ++++++++++++++++++++++------------------------
 1 file changed, 22 insertions(+), 24 deletions(-)

diff --git a/utils.py b/utils.py
index 83a54c1..607d9d8 100644
--- a/utils.py
+++ b/utils.py
@@ -1,55 +1,53 @@
+from __future__ import annotations
 from collections import deque
-from collections.abc import Iterable, Iterator, Generator
+from collections.abc import Iterable, Iterator
 from dataclasses import dataclass
 from itertools import islice
 from math import sqrt
 from sys import argv
 from typing import TypeVar, Generic, Union, Optional, cast
 
-Numeric = Union[int, float]
+NumT = TypeVar('NumT', float, int)
 
-T = TypeVar('T', bound=Numeric)
 @dataclass(frozen=True)
-class Point2D(Generic[T]):
-    x: T
-    y: T
+class Point2D(Generic[NumT]):
+    x: NumT
+    y: NumT
 
     def __str__(self) -> str:
         return f'({self.x}, {self.y})'
 
-    def __add__(self, other: 'Point2D') -> Union['Point2D', bool]:
+    def __add__(self, other: Point2D[NumT]) -> Union[Point2D[NumT], bool]:
         if isinstance(other, Point2D):
             return Point2D(self.x + other.x, self.y + other.y)
         return NotImplemented
 
-    def __sub__(self, other: 'Point2D') -> Union['Point2D', bool]:
+    def __sub__(self, other: Point2D[NumT]) -> Union[Point2D[NumT], bool]:
         if isinstance(other, Point2D):
             return Point2D(self.x - other.x, self.y - other.y)
         return NotImplemented
 
-    def __abs__(self) -> 'Point2D':
-        return Point2D(abs(self.x), abs(self.y))
+    def __abs__(self) -> Point2D[NumT]:
+        return Point2D(cast(NumT, abs(self.x)), cast(NumT, abs(self.y)))
 
-T = TypeVar('T', bound=Numeric)
-def norm_1(p: Point2D[T]) -> T:
-    return abs(p.x) + abs(p.y)
+def norm_1(p: Point2D[NumT]) -> NumT:
+    return cast(NumT, abs(p.x) + abs(p.y))
 
 def norm_2(p: Point2D) -> float:
     return sqrt(p.x ** 2 + p.y ** 2)
 
-T = TypeVar('T', bound=Numeric)
-def norm_inf(p: Point2D[T]) -> T:
-    return max(abs(p.x), abs(p.y))
+def norm_inf(p: Point2D[NumT]) -> NumT:
+    return cast(NumT, max(abs(p.x), abs(p.y)))
 
-T = TypeVar('T', bound=Numeric)
-def inbounds(p: Point2D[T], a: Point2D[T], b: Optional[Point2D[T]] = None) -> bool:
-    if b is None and isinstance(a.x, int):
+def inbounds(p: Point2D[NumT], a: Point2D[NumT], _b: Optional[Point2D[NumT]] = None) -> bool:
+    if isinstance(_b, Point2D):
+        b = _b
+    else:
         b = a
-        a = cast(Point2D[T], Point2D(0, 0))
+        a = cast(Point2D[NumT], Point2D(0, 0))
     return p.x >= a.x and p.y >= a.y and p.x < b.x and p.y < b.y
 
-def adjacent(p: Point2D[int], diagonal: bool = True) \
-        -> Generator[Point2D[int], None, None]:
+def adjacent(p: Point2D[int], diagonal: bool = True) -> Iterator[Point2D[int]]:
     for dx in range(-1, 2):
         for dy in range(-1, 2):
             if dx == 0 and dy == 0: continue
@@ -57,11 +55,11 @@ def adjacent(p: Point2D[int], diagonal: bool = True) \
             yield Point2D(p.x + dx, p.y + dy)
 
 def adjacent_bounded(p: Point2D[int], bound: Point2D[int], diagonal: bool = True) \
-        -> filter[Point2D[int]]: # This has to return filter[...] not Generator[...] because ???
+        -> Iterator[Point2D[int]]:
     return filter(lambda p: inbounds(p, bound), adjacent(p, diagonal))
 
 T = TypeVar('T')
-def sliding_window(iterable: Iterable[T], n: int) -> Generator[tuple[T, ...], None, None]:
+def sliding_window(iterable: Iterable[T], n: int) -> Iterator[tuple[T, ...]]:
     # sliding_window('ABCDEFG', 4) -> ABCD BCDE CDEF DEFG
     it: Iterator[T] = iter(iterable)
     window: deque[T] = deque(islice(it, n), maxlen=n)
-- 
cgit v1.2.3-54-g00ecf