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Exercise 15

Without running the following code, what values will be printed by line 10?

pets = {
    'Cat':  'Meow',
    'Dog':  'Bark',
    'Bird': 'Tweet',
}

keys = pets.keys()
del pets['Dog']
pets['Snake'] = 'Sssss'
print(keys)

Solution

dict_keys(['Cat', 'Bird', 'Snake'])

Since dict.keys returns a dictionary view object, any changes made to the dictionary after you call the keys method will be reflected in dictionary view referenced by keys immediately.

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