unify None indexing exception message

Cython/Utility/ObjectHandling.c

@@ -16,7 +16,7 @@ static CYTHON_INLINE void __Pyx_RaiseNoneIndexingError(void);
 /////////////// RaiseNoneIndexingError ///////////////
 
 static CYTHON_INLINE void __Pyx_RaiseNoneIndexingError(void) {
-    PyErr_SetString(PyExc_TypeError, "'NoneType' object is unsubscriptable");
+    PyErr_SetString(PyExc_TypeError, "'NoneType' object is not subscriptable");
 }
 
 /////////////// RaiseNoneIterError.proto ///////////////

tests/run/index.pyx

@@ -24,7 +24,7 @@ def index_tuple(tuple t, int i):
     IndexError: tuple index out of range
     >>> index_tuple(None, 0)
     Traceback (most recent call last):
-    TypeError: 'NoneType' object is unsubscriptable
+    TypeError: 'NoneType' object is not subscriptable
     """
     return t[i]
 
@@ -41,7 +41,7 @@ def index_list(list L, int i):
     IndexError: list index out of range
     >>> index_list(None, 0)
     Traceback (most recent call last):
-    TypeError: 'NoneType' object is unsubscriptable
+    TypeError: 'NoneType' object is not subscriptable
     """
     return L[i]
 
@@ -65,7 +65,7 @@ def index_object(object o, int i):
     IndexError: string index out of range
     >>> index_object(None, 0)
     Traceback (most recent call last):
-    TypeError: 'NoneType' object is unsubscriptable
+    TypeError: 'NoneType' object is not subscriptable
     """
     return o[i]
 

tests/run/nonecheck.pyx

@@ -19,7 +19,6 @@ def getattr_(MyClass var):
     2
     >>> getattr_(None)
     Traceback (most recent call last):
-    ...
     AttributeError: 'NoneType' object has no attribute 'a'
     >>> setattr_(obj)
     >>> getattr_(obj)
@@ -34,7 +33,6 @@ def setattr_(MyClass var):
     >>> setattr_(obj)
     >>> setattr_(None)
     Traceback (most recent call last):
-    ...
     AttributeError: 'NoneType' object has no attribute 'a'
     """
     var.a = 10
@@ -66,7 +64,6 @@ def check_and_assign(MyClass var):
     >>> obj = MyClass(2, 3)
     >>> check_and_assign(obj)
     Traceback (most recent call last):
-    ...
     AttributeError: 'NoneType' object has no attribute 'a'
     """
     if var is not None:
@@ -79,8 +76,7 @@ def check_buffer_get(object[int] buf):
     """
     >>> check_buffer_get(None)
     Traceback (most recent call last):
-    ...
-    TypeError: 'NoneType' object is unsubscriptable
+    TypeError: 'NoneType' object is not subscriptable
     """
     return buf[0]
 
@@ -89,7 +85,6 @@ def check_buffer_set(object[int] buf):
     """
     >>> check_buffer_set(None)
     Traceback (most recent call last):
-    ...
-    TypeError: 'NoneType' object is unsubscriptable
+    TypeError: 'NoneType' object is not subscriptable
     """
     buf[0] = 1