Fix exclusion of fractions/quicktions in type checks

mutwo/core_constants/__init__.py

@@ -4,7 +4,9 @@
 import fractions
 import typing
 
-Real = typing.Union[float, fractions.Fraction, int]
+import quicktions
+
+Real = typing.Union[float, fractions.Fraction, quicktions.Fraction, int]
 """The main reason for this constant is a mypy issue with Pythons buildin
 [numbers module](https://docs.python.org/3/library/numbers.html) which
 is documented [here](https://github.com/python/mypy/issues/3186). Mypy

mutwo/core_events/configurations.py

@@ -1,11 +1,9 @@
 """Configurations which are shared for all event classes in :mod:`mutwo.core_events`."""
 
+import fractions
 import typing
 
-try:
-    import quicktions as fractions
-except ImportError:
-    import fractions
+import quicktions
 
 # XXX: We can't set core_converters.UnknownObjectToObject
 # directly because it would raise a circular import error.
@@ -14,7 +12,12 @@ def __unknown_object_to_duration(unknown_object):
     from mutwo import core_parameters
 
     return core_converters.UnknownObjectToObject[core_parameters.abc.Duration](
-        (((float, int, fractions.Fraction), core_parameters.DirectDuration),)
+        (
+            (
+                (float, int, fractions.Fraction, quicktions.Fraction),
+                core_parameters.DirectDuration,
+            ),
+        )
     )(unknown_object)