Cannot => cannot

Author: vstinner

Lib/test/test_capi/test_abstract.py

@@ -460,7 +460,7 @@ def test_mapping_haskey(self):
             self.assertFalse(haskey({}, []))
             self.assertEqual(cm.unraisable.exc_type, TypeError)
             self.assertEqual(str(cm.unraisable.exc_value),
-                             "Cannot use 'list' as a dict key "
+                             "cannot use 'list' as a dict key "
                              "(unhashable type: 'list')")
 
         with support.catch_unraisable_exception() as cm:

Lib/test/test_dict.py

@@ -1493,7 +1493,7 @@ def test_unhashable_key(self):
         key = [1, 2, 3]
 
         def check_unhashable_key():
-            msg = "Cannot use 'list' as a dict key (unhashable type: 'list')"
+            msg = "cannot use 'list' as a dict key (unhashable type: 'list')"
             return self.assertRaisesRegex(TypeError, re.escape(msg))
 
         with check_unhashable_key():

Lib/test/test_set.py

@@ -651,7 +651,7 @@ def test_unhashable_element(self):
         elem = [1, 2, 3]
 
         def check_unhashable_element():
-            msg = "Cannot use 'list' as a set element (unhashable type: 'list')"
+            msg = "cannot use 'list' as a set element (unhashable type: 'list')"
             return self.assertRaisesRegex(TypeError, re.escape(msg))
 
         with check_unhashable_element():

Objects/dictobject.c

@@ -2287,7 +2287,7 @@ dict_unhashtable_type(PyObject *key)
     }
 
     PyErr_Format(PyExc_TypeError,
-                 "Cannot use '%T' as a dict key (%S)",
+                 "cannot use '%T' as a dict key (%S)",
                  key, exc);
     Py_DECREF(exc);
 }

Objects/setobject.c

@@ -222,7 +222,7 @@ set_unhashtable_type(PyObject *key)
     }
 
     PyErr_Format(PyExc_TypeError,
-                 "Cannot use '%T' as a set element (%S)",
+                 "cannot use '%T' as a set element (%S)",
                  key, exc);
     Py_DECREF(exc);
 }