Add _types.py for uncertainty calculator data structures

Introduced a new module, _types.py, containing dataclass definitions for Equation, Variable, and Digits, which are essential for the uncertainty calculator's functionality. Updated imports in calculator, compute, parsing, and rendering modules to utilize the new types. Adjusted the last_unit attribute in UncertaintyCalculator and RenderOptions to accept a string or None, enhancing type flexibility. This update aims to improve code organization and type safety across the project.

Author: FridrichMethod

src/uncertainty_calculator/types.py src/uncertainty_calculator/_types.pysrc/uncertainty_calculator/types.py renamed to src/uncertainty_calculator/_types.py

@@ -67,4 +67,3 @@ def __post_init__(self) -> None:
 
 # Type definitions matching Python 3.12 style
 type Variables = Iterable[Variable]
-type LastUnit = str | None

src/uncertainty_calculator/calculator.py

@@ -2,10 +2,10 @@
 
 from __future__ import annotations
 
+from uncertainty_calculator._types import Digits, Equation, Variables
 from uncertainty_calculator.compute import ComputeState, compute
 from uncertainty_calculator.parsing import ParseState, parse_inputs
 from uncertainty_calculator.rendering import RenderOptions, render_output
-from uncertainty_calculator.types import Digits, Equation, LastUnit, Variables
 from uncertainty_calculator.validation import validate_inputs
 
 
@@ -15,7 +15,7 @@ class UncertaintyCalculator:
     def __init__(
         self,
         digits: Digits,
-        last_unit: LastUnit,
+        last_unit: str | None,
         separate: bool,
         insert: bool,
         include_equation_number: bool,

src/uncertainty_calculator/compute.py

@@ -7,9 +7,9 @@
 
 from sympy import S, diff, simplify, sqrt
 
+from uncertainty_calculator._types import Digits
 from uncertainty_calculator.formatting import latex_number
 from uncertainty_calculator.parsing import ParseState
-from uncertainty_calculator.types import Digits
 
 
 @dataclass

src/uncertainty_calculator/parsing.py

@@ -8,8 +8,8 @@
 
 from sympy import Symbol, symbols, sympify
 
+from uncertainty_calculator._types import Equation, Variables
 from uncertainty_calculator.formatting import latex_number
-from uncertainty_calculator.types import Equation, Variables
 
 
 @dataclass

src/uncertainty_calculator/rendering.py

@@ -9,14 +9,13 @@
 from uncertainty_calculator.compute import ComputeState
 from uncertainty_calculator.formatting import latex_number, latex_symbol, latex_value
 from uncertainty_calculator.parsing import ParseState
-from uncertainty_calculator.types import LastUnit
 
 
 @dataclass
 class RenderOptions:
     """Rendering configuration for the output."""
 
-    last_unit: LastUnit
+    last_unit: str | None
     separate: bool
     insert: bool
     include_equation_number: bool

tests/legacy_calculator.py

@@ -8,14 +8,14 @@
 from collections.abc import Iterable, Sequence
 
 from sympy import diff, latex, simplify, sqrt, symbols, sympify
-from uncertainty_calculator import Digits, LastUnit
+from uncertainty_calculator import Digits
 
 
 def run_legacy_calculator(  # noqa: C901
     equation: Sequence[str],
     variables: Iterable[tuple[str, str]],
     digits: Digits,
-    last_unit: LastUnit,
+    last_unit: str | None,
     separate: bool,
     insert: bool,
     include_equation_number: bool,