The in and not in operators can check whether a key is in a dictionary. For example, 'one' in {'one': 1, 'two': 2} is true, but 'three' in {'one': 1, 'two': 2} is false. The dictionary's values are not considered, so 2 in {'one': 1, 'two': 2} is also false.

The values method can be used to get just a dictionary's values, which is useful for testing whether the dictionary holds a particular value. For instance, {'one': 1, 'two': 2}.values() is a collection containing 1 and 2, so 'two' in {'one': 1, 'two': 2}.values() is false, and 2 in {'one': 1, 'two': 2}.values() is true.

There is a keys method, and it is possible to write an expression like 'two' in {'one': 1, 'two': 2}.keys(), which means the same thing as 'two' in {'one': 1, 'two': 2}, but this is considered bad style. The keys method is generally only used when the code needs to apply set operations on a dictionary's keys.

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