Update type hints (#41)

This PR updates type hints to more recent (but still Python
3.10-compatible) syntax.

Also adds the `pyupgrade` checks to the ruff linter.

Author: mdickinson

proofs/fraction_to_float.py

@@ -1,8 +1,7 @@
-import typing
 from math import gcd
 
 
-def find_cd(a: int, b: int) -> typing.List[typing.Tuple[int, int]]:
+def find_cd(a: int, b: int) -> list[tuple[int, int]]:
     """
     Given a positive fraction a/b (expressed in lowest terms), find both
     fractions c/d which are simpler than a/b and which satisfy |ad - bc| = 1.

pyproject.toml

@@ -43,4 +43,4 @@ addopts = ["--pyargs", "--import-mode=importlib"]
 target-version = "py310"
 
 [tool.ruff.lint]
-extend-select = ["I", "W"]  # isort, pycodestyle warnings
+extend-select = ["I", "UP", "W"]  # isort, pyupgrade, pycodestyle warnings

src/simplefractions/__init__.py

@@ -48,12 +48,12 @@
 
 #: Type that roughly matches "number acceptable by the fractions.Fraction
 #: constructor"
-FractionCompatible = typing.Union[int, float, decimal.Decimal, numbers.Rational]
+FractionCompatible: typing.TypeAlias = int | float | decimal.Decimal | numbers.Rational
 
 
 def simplest_in_interval(
-    left: typing.Optional[FractionCompatible] = None,
-    right: typing.Optional[FractionCompatible] = None,
+    left: FractionCompatible | None = None,
+    right: FractionCompatible | None = None,
     *,
     include_left: bool = False,
     include_right: bool = False,
@@ -111,7 +111,7 @@ def simplest_in_interval(
 
 def _interval_rounding_to(
     x: float,
-) -> typing.Tuple[fractions.Fraction, fractions.Fraction, bool]:
+) -> tuple[fractions.Fraction, fractions.Fraction, bool]:
     """
     Return the interval of numbers that round to a given float.
 

src/simplefractions/_simplest_in_interval.py

@@ -105,12 +105,11 @@
 """
 
 import fractions
-import typing
 
 
 def _simplest_in_interval_pos(
     r: int, s: int, t: bool, u: int, v: int, w: bool
-) -> typing.Tuple[int, int]:
+) -> tuple[int, int]:
     """
     Simplest fraction in a subinterval of the positive reals.
 
@@ -147,8 +146,8 @@ def _simplest_in_interval_pos(
 
 
 def _simplest_in_interval(
-    left: typing.Optional[fractions.Fraction] = None,
-    right: typing.Optional[fractions.Fraction] = None,
+    left: fractions.Fraction | None = None,
+    right: fractions.Fraction | None = None,
     *,
     include_left: bool = False,
     include_right: bool = False,