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>>> d = {"first_name": "Cosmo", "last_name": "Kramer"}
# Create a `dict_keys` view of the keys
>>> keys = d.keys()
>>> keys
dict_keys(['first_name', 'last_name'])
# Now remove a key...
>>> del d['last_name']
# ... and now the view of the keys reflects the new contents
>>> keys
dict_keys(['first_name'])

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Python Dictionary Tricks: keys(), values() and items() are dynamic

When you get the keys(), values() or items() from a dictionary, you are given a view of the elements in the dictionary. If you modify the dictionary the reference you have is updated to reflect this.

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