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</source>
Dictionary keys can be individually deleted using the del statement. The corresponding value can be returned before the key-value pair are deleted using the pop method of dict types
<source lang="python">
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val = phonebook.pop('Sally Smart')
assert phonebook.keys() == ['J. Random Hacker'] # Only one key left
</source>
Python 3.0 also supports dictionary comprehensions, a compact syntax for generating a dictionary from any iterator:
<source lang="python">
square_dict={i:i*i for i in range(5)}
assert square_dict == {0: 0, 1: 1, 2: 4, 3: 9, 4: 16}
</source>
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