Chapter 6 -- Page 208 -- Line 9

There is a missing space between __main__ and namespace.

Chapter 4 --Page 140-141 -- Listing 4.7

The values method returns a dict_values object, not a list. However, it can be turned into a list by using the list() function. Line 10 of listing 4.7 should be

countlist = list(countlist.values())

Then the max function is legal on countlist (as shown on line 11).

The text on page 140 should read

Recall that the values() method returns a dict_values object which can be turned into a list by applying the list function.