diff --git a/Doc/tutorial/introduction.rst b/Doc/tutorial/introduction.rst
index 22a209c..e68c9b1 100644
--- a/Doc/tutorial/introduction.rst
+++ b/Doc/tutorial/introduction.rst
@@ -223,10 +223,14 @@
 
    >>> prefix = 'Py'
    >>> prefix 'thon'  # can't concatenate a variable and a string literal
-     ...
+     File "<stdin>", line 1
+       prefix 'thon'
+                   ^
    SyntaxError: invalid syntax
    >>> ('un' * 3) 'ium'
-     ...
+     File "<stdin>", line 1
+       ('un' * 3) 'ium'
+                      ^
    SyntaxError: invalid syntax
 
 If you want to concatenate variables or a variable and a literal, use ``+``::
@@ -320,10 +324,12 @@
 Therefore, assigning to an indexed position in the string results in an error::
 
    >>> word[0] = 'J'
-     ...
+   Traceback (most recent call last):
+     File "<stdin>", line 1, in <module>
    TypeError: 'str' object does not support item assignment
    >>> word[2:] = 'py'
-     ...
+   Traceback (most recent call last):
+     File "<stdin>", line 1, in <module>
    TypeError: 'str' object does not support item assignment
 
 If you need a different string, you should create a new one::