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- from toolz import first, identity, countby, partitionby
- def iseven(x):
- return x % 2 == 0
- def test_countby():
- assert countby(iseven, [1, 2, 3]) == {True: 1, False: 2}
- assert countby(len, ['cat', 'dog', 'mouse']) == {3: 2, 5: 1}
- assert countby(0, ('ab', 'ac', 'bc')) == {'a': 2, 'b': 1}
- def test_partitionby():
- assert list(partitionby(identity, [])) == []
- vowels = "aeiou"
- assert (list(partitionby(vowels.__contains__, "abcdefghi")) ==
- [("a",), ("b", "c", "d"), ("e",), ("f", "g", "h"), ("i",)])
- assert (list(map(first,
- partitionby(identity,
- [1, 1, 1, 2, 3, 3, 2, 2, 3]))) ==
- [1, 2, 3, 2, 3])
- assert ''.join(map(first,
- partitionby(identity, "Khhhaaaaannnnn!!!!"))) == 'Khan!'
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