#4668: wrap iterator returns in list() in functional howto.
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@ -634,7 +634,7 @@ features of generator expressions:
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... return s.upper()
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>>> map(upper, ['sentence', 'fragment'])
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>>> list(map(upper, ['sentence', 'fragment']))
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['SENTENCE', 'FRAGMENT']
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>>> [upper(s) for s in ['sentence', 'fragment']]
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['SENTENCE', 'FRAGMENT']
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@ -650,7 +650,7 @@ value.
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>>> def is_even(x):
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... return (x % 2) == 0
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>>> filter(is_even, range(10))
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>>> list(filter(is_even, range(10)))
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[0, 2, 4, 6, 8]
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