Always assign new list in examples.

Author: ecmendenhall

python/lesson3/tutorial.md

@@ -74,21 +74,18 @@ for a more complete reference:
     >>> places_to_visit
     ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand']
 
-    >>> places_to_visit
-    ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand']
+    >>> places_to_visit = ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand']
     >>> places_to_visit[1] = "Peru"
     >>> places_to_visit
     ['Mexico', 'Peru', 'Kenya', 'Nepal', 'New Zealand']
 
-    >>> places_to_visit
-    ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand']
+    >>> places_to_visit = ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand']
     >>> places_to_visit.pop()
     'New Zealand'
     >>> places_to_visit
     ['Mexico', 'Portugal', 'Kenya', 'Nepal']
 
-    >>> places_to_visit
-    ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand']
+    >>> places_to_visit = ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand']
     >>> places_to_visit.append("Colombia")
     >>> places_to_visit
     ['Mexico', 'Portugal', 'Kenya', 'Nepal', 'New Zealand', 'Colombia']