torch: allow python scalars in result_type

Author: ev-br

Diff for: array_api_compat/torch/_aliases.py

@@ -125,7 +125,11 @@ def _fix_promotion(x1, x2, only_scalar=True):
         x1 = x1.to(dtype)
     return x1, x2
 
-def result_type(*arrays_and_dtypes: Union[array, Dtype]) -> Dtype:
+
+_py_scalars = (bool, int, float, complex)
+
+
+def result_type(*arrays_and_dtypes: Union[array, Dtype, bool, int, float, complex]) -> Dtype:
     if len(arrays_and_dtypes) == 0:
         raise TypeError("At least one array or dtype must be provided")
     if len(arrays_and_dtypes) == 1:
@@ -137,6 +141,9 @@ def result_type(*arrays_and_dtypes: Union[array, Dtype]) -> Dtype:
         return result_type(arrays_and_dtypes[0], result_type(*arrays_and_dtypes[1:]))
 
     x, y = arrays_and_dtypes
+    if isinstance(x, _py_scalars) or isinstance(y, _py_scalars):
+        return torch.result_type(x, y)
+
     xdt = x.dtype if not isinstance(x, torch.dtype) else x
     ydt = y.dtype if not isinstance(y, torch.dtype) else y