rendering Fractions now uses simpler implementation from particle.py

src/qrules/io/_dot.py

@@ -18,7 +18,7 @@
 from attrs import Attribute, define, field
 from attrs.converters import default_if_none
 
-from qrules.particle import Particle, ParticleWithSpin, Spin
+from qrules.particle import Particle, ParticleWithSpin, Spin, _render_fraction
 from qrules.quantum_numbers import InteractionProperties
 from qrules.solving import EdgeSettings, NodeSettings, QNProblemSet, QNResult
 from qrules.topology import FrozenTransition, MutableTransition, Topology, Transition
@@ -321,16 +321,6 @@ def _(obj: dict) -> str:
     return "\n".join(lines)
 
 
-def _render_fraction(fraction: Fraction, plusminus: bool = False) -> str:
-    if plusminus:
-        if fraction.denominator == 1:
-            if fraction.numerator > 0:
-                return f"{fraction.numerator:+}"
-            return str(fraction)
-        return f"{fraction.numerator:+}/{fraction.denominator}"
-    return str(fraction)
-
-
 @as_string.register(InteractionProperties)
 def _(obj: InteractionProperties) -> str:
     lines = []

src/qrules/particle.py

@@ -114,14 +114,14 @@ def __repr__(self) -> str:
 
     def _repr_pretty_(self, p: PrettyPrinter, _: bool) -> None:
         class_name = type(self).__name__
-        magnitude = _to_signed_fraction(self.magnitude)
-        projection = _to_signed_fraction(self.projection, render_plus=True)
+        magnitude = _render_fraction(self.magnitude)
+        projection = _render_fraction(self.projection, plusminus=True)
         p.text(f"{class_name}({magnitude}, {projection})")
 
 
-def _to_signed_fraction(fraction: Fraction, render_plus: bool = False) -> str:
+def _render_fraction(fraction: Fraction, plusminus: bool = False) -> str:
     string_representation = str(fraction)
-    if render_plus and fraction.numerator > 0:
+    if plusminus and fraction.numerator > 0:
         return f"+{string_representation}"
     return string_representation