action: fix doc issue

Author: james-d-mitchell

libsemigroups_pybind11/action.py

@@ -212,7 +212,9 @@ def __init__(
         if _to_cxx(self) is not None:
             return
         if len(args) != 0:
-            raise ValueError(f"expected 0 positional arguments, but found {len(args)}")
+            raise ValueError(
+                f"expected 0 positional arguments, but found {len(args)}"
+            )
         if not isinstance(generators, list):
             raise TypeError(
                 "expected the keyword argument 'generators' to be "
@@ -275,7 +277,11 @@ def generators(self: _Self) -> Iterator[Element]:
 
 _copy_cxx_mem_fns(_RightActionPPerm1PPerm1, Action)
 
-for _type in Action._py_template_params_to_cxx_type.values():  # pylint: disable=protected-access
+for (
+    _type
+) in (
+    Action._py_template_params_to_cxx_type.values()
+):  # pylint: disable=protected-access
     _register_cxx_wrapped_type(_type, Action)
 
 ########################################################################
@@ -309,7 +315,7 @@ def __init__(self: _Self, *args, generators=None, seeds=None) -> None:
         :raises ValueError:
             if *generators* or *seeds* has length ``0``.
         :raises KeyError:
-            if the action defined by the arguments is not defined.
+            if the action given by the arguments is not yet implemented.
         """
         super().__init__(
             *args,
@@ -351,7 +357,7 @@ def __init__(self: _Self, *args, generators=None, seeds=None) -> None:
         :raises ValueError:
             if *generators* or *seeds* has length ``0``.
         :raises KeyError:
-            if the action defined by the arguments is not defined.
+            if the action given by the arguments is not yet implemented.
         """
         super().__init__(
             generators=generators,