Fix flake8

graphene/types/argument.py

@@ -94,7 +94,8 @@ def to_arguments(args, extra_args=None):
 
         if isinstance(arg, (InputField, Field)):
             raise ValueError(
-                f"Expected {default_name} to be Argument, but received {type(arg).__name__}. Try using Argument({arg.type})."
+                f"Expected {default_name} to be Argument, "
+                f"but received {type(arg).__name__}. Try using Argument({arg.type})."
             )
 
         if not isinstance(arg, Argument):

graphene/types/structures.py

@@ -14,7 +14,8 @@ class Structure(UnmountedType):
             cls_name = type(self).__name__
             of_type_name = type(of_type).__name__
             raise Exception(
-                f"{cls_name} could not have a mounted {of_type_name}() as inner type. Try with {cls_name}({of_type_name})."
+                f"{cls_name} could not have a mounted {of_type_name}()"
+                f" as inner type. Try with {cls_name}({of_type_name})."
             )
         self._of_type = of_type