part of #4144: fix exception message in console session.
diff --git a/Doc/tutorial/introduction.rst b/Doc/tutorial/introduction.rst
index 21d3627..23ff522 100644
--- a/Doc/tutorial/introduction.rst
+++ b/Doc/tutorial/introduction.rst
@@ -285,11 +285,11 @@
>>> word[0] = 'x'
Traceback (most recent call last):
File "<stdin>", line 1, in ?
- TypeError: object doesn't support item assignment
+ TypeError: object does not support item assignment
>>> word[:1] = 'Splat'
Traceback (most recent call last):
File "<stdin>", line 1, in ?
- TypeError: object doesn't support slice assignment
+ TypeError: object does not support slice assignment
However, creating a new string with the combined content is easy and efficient::