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527 lines
17 KiB
Python
527 lines
17 KiB
Python
import itertools
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from itertools import starmap
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from toolz.utils import raises
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from functools import partial
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from random import Random
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from pickle import dumps, loads
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from toolz.itertoolz import (remove, groupby, merge_sorted,
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concat, concatv, interleave, unique,
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isiterable, getter,
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mapcat, isdistinct, first, second,
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nth, take, tail, drop, interpose, get,
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rest, last, cons, frequencies,
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reduceby, iterate, accumulate,
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sliding_window, count, partition,
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partition_all, take_nth, pluck, join,
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diff, topk, peek, random_sample)
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from toolz.compatibility import range, filter
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from operator import add, mul
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# is comparison will fail between this and no_default
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no_default2 = loads(dumps('__no__default__'))
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def identity(x):
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return x
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def iseven(x):
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return x % 2 == 0
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def isodd(x):
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return x % 2 == 1
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def inc(x):
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return x + 1
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def double(x):
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return 2 * x
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def test_remove():
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r = remove(iseven, range(5))
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assert type(r) is not list
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assert list(r) == list(filter(isodd, range(5)))
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def test_groupby():
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assert groupby(iseven, [1, 2, 3, 4]) == {True: [2, 4], False: [1, 3]}
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def test_groupby_non_callable():
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assert groupby(0, [(1, 2), (1, 3), (2, 2), (2, 4)]) == \
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{1: [(1, 2), (1, 3)],
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2: [(2, 2), (2, 4)]}
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assert groupby([0], [(1, 2), (1, 3), (2, 2), (2, 4)]) == \
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{(1,): [(1, 2), (1, 3)],
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(2,): [(2, 2), (2, 4)]}
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assert groupby([0, 0], [(1, 2), (1, 3), (2, 2), (2, 4)]) == \
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{(1, 1): [(1, 2), (1, 3)],
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(2, 2): [(2, 2), (2, 4)]}
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def test_merge_sorted():
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assert list(merge_sorted([1, 2, 3], [1, 2, 3])) == [1, 1, 2, 2, 3, 3]
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assert list(merge_sorted([1, 3, 5], [2, 4, 6])) == [1, 2, 3, 4, 5, 6]
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assert list(merge_sorted([1], [2, 4], [3], [])) == [1, 2, 3, 4]
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assert list(merge_sorted([5, 3, 1], [6, 4, 3], [],
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key=lambda x: -x)) == [6, 5, 4, 3, 3, 1]
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assert list(merge_sorted([2, 1, 3], [1, 2, 3],
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key=lambda x: x // 3)) == [2, 1, 1, 2, 3, 3]
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assert list(merge_sorted([2, 3], [1, 3],
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key=lambda x: x // 3)) == [2, 1, 3, 3]
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assert ''.join(merge_sorted('abc', 'abc', 'abc')) == 'aaabbbccc'
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assert ''.join(merge_sorted('abc', 'abc', 'abc', key=ord)) == 'aaabbbccc'
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assert ''.join(merge_sorted('cba', 'cba', 'cba',
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key=lambda x: -ord(x))) == 'cccbbbaaa'
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assert list(merge_sorted([1], [2, 3, 4], key=identity)) == [1, 2, 3, 4]
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data = [[(1, 2), (0, 4), (3, 6)], [(5, 3), (6, 5), (8, 8)],
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[(9, 1), (9, 8), (9, 9)]]
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assert list(merge_sorted(*data, key=lambda x: x[1])) == [
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(9, 1), (1, 2), (5, 3), (0, 4), (6, 5), (3, 6), (8, 8), (9, 8), (9, 9)]
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assert list(merge_sorted()) == []
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assert list(merge_sorted([1, 2, 3])) == [1, 2, 3]
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assert list(merge_sorted([1, 4, 5], [2, 3])) == [1, 2, 3, 4, 5]
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assert list(merge_sorted([1, 4, 5], [2, 3], key=identity)) == [
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1, 2, 3, 4, 5]
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assert list(merge_sorted([1, 5], [2], [4, 7], [3, 6], key=identity)) == [
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1, 2, 3, 4, 5, 6, 7]
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def test_interleave():
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assert ''.join(interleave(('ABC', '123'))) == 'A1B2C3'
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assert ''.join(interleave(('ABC', '1'))) == 'A1BC'
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def test_unique():
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assert tuple(unique((1, 2, 3))) == (1, 2, 3)
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assert tuple(unique((1, 2, 1, 3))) == (1, 2, 3)
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assert tuple(unique((1, 2, 3), key=iseven)) == (1, 2)
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def test_isiterable():
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assert isiterable([1, 2, 3]) is True
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assert isiterable('abc') is True
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assert isiterable(5) is False
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def test_isdistinct():
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assert isdistinct([1, 2, 3]) is True
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assert isdistinct([1, 2, 1]) is False
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assert isdistinct("Hello") is False
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assert isdistinct("World") is True
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assert isdistinct(iter([1, 2, 3])) is True
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assert isdistinct(iter([1, 2, 1])) is False
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def test_nth():
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assert nth(2, 'ABCDE') == 'C'
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assert nth(2, iter('ABCDE')) == 'C'
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assert nth(1, (3, 2, 1)) == 2
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assert nth(0, {'foo': 'bar'}) == 'foo'
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assert raises(StopIteration, lambda: nth(10, {10: 'foo'}))
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assert nth(-2, 'ABCDE') == 'D'
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assert raises(ValueError, lambda: nth(-2, iter('ABCDE')))
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def test_first():
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assert first('ABCDE') == 'A'
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assert first((3, 2, 1)) == 3
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assert isinstance(first({0: 'zero', 1: 'one'}), int)
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def test_second():
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assert second('ABCDE') == 'B'
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assert second((3, 2, 1)) == 2
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assert isinstance(second({0: 'zero', 1: 'one'}), int)
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def test_last():
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assert last('ABCDE') == 'E'
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assert last((3, 2, 1)) == 1
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assert isinstance(last({0: 'zero', 1: 'one'}), int)
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def test_rest():
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assert list(rest('ABCDE')) == list('BCDE')
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assert list(rest((3, 2, 1))) == list((2, 1))
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def test_take():
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assert list(take(3, 'ABCDE')) == list('ABC')
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assert list(take(2, (3, 2, 1))) == list((3, 2))
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def test_tail():
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assert list(tail(3, 'ABCDE')) == list('CDE')
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assert list(tail(3, iter('ABCDE'))) == list('CDE')
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assert list(tail(2, (3, 2, 1))) == list((2, 1))
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def test_drop():
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assert list(drop(3, 'ABCDE')) == list('DE')
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assert list(drop(1, (3, 2, 1))) == list((2, 1))
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def test_take_nth():
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assert list(take_nth(2, 'ABCDE')) == list('ACE')
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def test_get():
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assert get(1, 'ABCDE') == 'B'
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assert list(get([1, 3], 'ABCDE')) == list('BD')
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assert get('a', {'a': 1, 'b': 2, 'c': 3}) == 1
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assert get(['a', 'b'], {'a': 1, 'b': 2, 'c': 3}) == (1, 2)
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assert get('foo', {}, default='bar') == 'bar'
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assert get({}, [1, 2, 3], default='bar') == 'bar'
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assert get([0, 2], 'AB', 'C') == ('A', 'C')
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assert get([0], 'AB') == ('A',)
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assert get([], 'AB') == ()
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assert raises(IndexError, lambda: get(10, 'ABC'))
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assert raises(KeyError, lambda: get(10, {'a': 1}))
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assert raises(TypeError, lambda: get({}, [1, 2, 3]))
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assert raises(TypeError, lambda: get([1, 2, 3], 1, None))
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assert raises(KeyError, lambda: get('foo', {}, default=no_default2))
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def test_mapcat():
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assert (list(mapcat(identity, [[1, 2, 3], [4, 5, 6]])) ==
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[1, 2, 3, 4, 5, 6])
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assert (list(mapcat(reversed, [[3, 2, 1, 0], [6, 5, 4], [9, 8, 7]])) ==
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list(range(10)))
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inc = lambda i: i + 1
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assert ([4, 5, 6, 7, 8, 9] ==
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list(mapcat(partial(map, inc), [[3, 4, 5], [6, 7, 8]])))
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def test_cons():
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assert list(cons(1, [2, 3])) == [1, 2, 3]
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def test_concat():
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assert list(concat([[], [], []])) == []
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assert (list(take(5, concat([['a', 'b'], range(1000000000)]))) ==
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['a', 'b', 0, 1, 2])
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def test_concatv():
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assert list(concatv([], [], [])) == []
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assert (list(take(5, concatv(['a', 'b'], range(1000000000)))) ==
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['a', 'b', 0, 1, 2])
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def test_interpose():
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assert "a" == first(rest(interpose("a", range(1000000000))))
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assert "tXaXrXzXaXn" == "".join(interpose("X", "tarzan"))
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assert list(interpose(0, itertools.repeat(1, 4))) == [1, 0, 1, 0, 1, 0, 1]
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assert list(interpose('.', ['a', 'b', 'c'])) == ['a', '.', 'b', '.', 'c']
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def test_frequencies():
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assert (frequencies(["cat", "pig", "cat", "eel",
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"pig", "dog", "dog", "dog"]) ==
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{"cat": 2, "eel": 1, "pig": 2, "dog": 3})
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assert frequencies([]) == {}
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assert frequencies("onomatopoeia") == {"a": 2, "e": 1, "i": 1, "m": 1,
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"o": 4, "n": 1, "p": 1, "t": 1}
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def test_reduceby():
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data = [1, 2, 3, 4, 5]
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iseven = lambda x: x % 2 == 0
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assert reduceby(iseven, add, data, 0) == {False: 9, True: 6}
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assert reduceby(iseven, mul, data, 1) == {False: 15, True: 8}
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projects = [{'name': 'build roads', 'state': 'CA', 'cost': 1000000},
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{'name': 'fight crime', 'state': 'IL', 'cost': 100000},
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{'name': 'help farmers', 'state': 'IL', 'cost': 2000000},
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{'name': 'help farmers', 'state': 'CA', 'cost': 200000}]
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assert reduceby(lambda x: x['state'],
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lambda acc, x: acc + x['cost'],
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projects, 0) == {'CA': 1200000, 'IL': 2100000}
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assert reduceby('state',
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lambda acc, x: acc + x['cost'],
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projects, 0) == {'CA': 1200000, 'IL': 2100000}
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def test_reduce_by_init():
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assert reduceby(iseven, add, [1, 2, 3, 4]) == {True: 2 + 4, False: 1 + 3}
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assert reduceby(iseven, add, [1, 2, 3, 4], no_default2) == {True: 2 + 4,
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False: 1 + 3}
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def test_reduce_by_callable_default():
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def set_add(s, i):
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s.add(i)
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return s
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assert reduceby(iseven, set_add, [1, 2, 3, 4, 1, 2], set) == \
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{True: set([2, 4]), False: set([1, 3])}
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def test_iterate():
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assert list(itertools.islice(iterate(inc, 0), 0, 5)) == [0, 1, 2, 3, 4]
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assert list(take(4, iterate(double, 1))) == [1, 2, 4, 8]
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def test_accumulate():
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assert list(accumulate(add, [1, 2, 3, 4, 5])) == [1, 3, 6, 10, 15]
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assert list(accumulate(mul, [1, 2, 3, 4, 5])) == [1, 2, 6, 24, 120]
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assert list(accumulate(add, [1, 2, 3, 4, 5], -1)) == [-1, 0, 2, 5, 9, 14]
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def binop(a, b):
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raise AssertionError('binop should not be called')
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start = object()
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assert list(accumulate(binop, [], start)) == [start]
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assert list(accumulate(add, [1, 2, 3], no_default2)) == [1, 3, 6]
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def test_accumulate_works_on_consumable_iterables():
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assert list(accumulate(add, iter((1, 2, 3)))) == [1, 3, 6]
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def test_sliding_window():
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assert list(sliding_window(2, [1, 2, 3, 4])) == [(1, 2), (2, 3), (3, 4)]
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assert list(sliding_window(3, [1, 2, 3, 4])) == [(1, 2, 3), (2, 3, 4)]
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def test_sliding_window_of_short_iterator():
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assert list(sliding_window(3, [1, 2])) == []
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def test_partition():
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assert list(partition(2, [1, 2, 3, 4])) == [(1, 2), (3, 4)]
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assert list(partition(3, range(7))) == [(0, 1, 2), (3, 4, 5)]
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assert list(partition(3, range(4), pad=-1)) == [(0, 1, 2),
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(3, -1, -1)]
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assert list(partition(2, [])) == []
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def test_partition_all():
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assert list(partition_all(2, [1, 2, 3, 4])) == [(1, 2), (3, 4)]
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assert list(partition_all(3, range(5))) == [(0, 1, 2), (3, 4)]
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assert list(partition_all(2, [])) == []
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def test_count():
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assert count((1, 2, 3)) == 3
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assert count([]) == 0
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assert count(iter((1, 2, 3, 4))) == 4
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assert count('hello') == 5
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assert count(iter('hello')) == 5
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def test_pluck():
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assert list(pluck(0, [[0, 1], [2, 3], [4, 5]])) == [0, 2, 4]
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assert list(pluck([0, 1], [[0, 1, 2], [3, 4, 5]])) == [(0, 1), (3, 4)]
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assert list(pluck(1, [[0], [0, 1]], None)) == [None, 1]
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data = [{'id': 1, 'name': 'cheese'}, {'id': 2, 'name': 'pies', 'price': 1}]
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assert list(pluck('id', data)) == [1, 2]
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assert list(pluck('price', data, 0)) == [0, 1]
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assert list(pluck(['id', 'name'], data)) == [(1, 'cheese'), (2, 'pies')]
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assert list(pluck(['name'], data)) == [('cheese',), ('pies',)]
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assert list(pluck(['price', 'other'], data, 0)) == [(0, 0), (1, 0)]
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assert raises(IndexError, lambda: list(pluck(1, [[0]])))
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assert raises(KeyError, lambda: list(pluck('name', [{'id': 1}])))
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assert list(pluck(0, [[0, 1], [2, 3], [4, 5]], no_default2)) == [0, 2, 4]
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assert raises(IndexError, lambda: list(pluck(1, [[0]], no_default2)))
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def test_join():
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names = [(1, 'one'), (2, 'two'), (3, 'three')]
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fruit = [('apple', 1), ('orange', 1), ('banana', 2), ('coconut', 2)]
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def addpair(pair):
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return pair[0] + pair[1]
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result = set(starmap(add, join(first, names, second, fruit)))
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expected = set([((1, 'one', 'apple', 1)),
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((1, 'one', 'orange', 1)),
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((2, 'two', 'banana', 2)),
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((2, 'two', 'coconut', 2))])
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assert result == expected
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result = set(starmap(add, join(first, names, second, fruit,
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left_default=no_default2,
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right_default=no_default2)))
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assert result == expected
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def test_getter():
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assert getter(0)('Alice') == 'A'
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assert getter([0])('Alice') == ('A',)
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assert getter([])('Alice') == ()
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def test_key_as_getter():
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squares = [(i, i**2) for i in range(5)]
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pows = [(i, i**2, i**3) for i in range(5)]
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assert set(join(0, squares, 0, pows)) == set(join(lambda x: x[0], squares,
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lambda x: x[0], pows))
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get = lambda x: (x[0], x[1])
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assert set(join([0, 1], squares, [0, 1], pows)) == set(join(get, squares,
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get, pows))
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get = lambda x: (x[0],)
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assert set(join([0], squares, [0], pows)) == set(join(get, squares,
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get, pows))
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def test_join_double_repeats():
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names = [(1, 'one'), (2, 'two'), (3, 'three'), (1, 'uno'), (2, 'dos')]
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fruit = [('apple', 1), ('orange', 1), ('banana', 2), ('coconut', 2)]
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result = set(starmap(add, join(first, names, second, fruit)))
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expected = set([((1, 'one', 'apple', 1)),
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((1, 'one', 'orange', 1)),
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((2, 'two', 'banana', 2)),
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((2, 'two', 'coconut', 2)),
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((1, 'uno', 'apple', 1)),
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((1, 'uno', 'orange', 1)),
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((2, 'dos', 'banana', 2)),
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((2, 'dos', 'coconut', 2))])
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assert result == expected
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def test_join_missing_element():
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names = [(1, 'one'), (2, 'two'), (3, 'three')]
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fruit = [('apple', 5), ('orange', 1)]
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result = set(starmap(add, join(first, names, second, fruit)))
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expected = set([((1, 'one', 'orange', 1))])
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assert result == expected
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def test_left_outer_join():
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result = set(join(identity, [1, 2], identity, [2, 3], left_default=None))
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expected = set([(2, 2), (None, 3)])
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assert result == expected
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def test_right_outer_join():
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result = set(join(identity, [1, 2], identity, [2, 3], right_default=None))
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expected = set([(2, 2), (1, None)])
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assert result == expected
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def test_outer_join():
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result = set(join(identity, [1, 2], identity, [2, 3],
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left_default=None, right_default=None))
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expected = set([(2, 2), (1, None), (None, 3)])
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assert result == expected
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def test_diff():
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assert raises(TypeError, lambda: list(diff()))
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assert raises(TypeError, lambda: list(diff([1, 2])))
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assert raises(TypeError, lambda: list(diff([1, 2], 3)))
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assert list(diff([1, 2], (1, 2), iter([1, 2]))) == []
|
|
assert list(diff([1, 2, 3], (1, 10, 3), iter([1, 2, 10]))) == [
|
|
(2, 10, 2), (3, 3, 10)]
|
|
assert list(diff([1, 2], [10])) == [(1, 10)]
|
|
assert list(diff([1, 2], [10], default=None)) == [(1, 10), (2, None)]
|
|
# non-variadic usage
|
|
assert raises(TypeError, lambda: list(diff([])))
|
|
assert raises(TypeError, lambda: list(diff([[]])))
|
|
assert raises(TypeError, lambda: list(diff([[1, 2]])))
|
|
assert raises(TypeError, lambda: list(diff([[1, 2], 3])))
|
|
assert list(diff([(1, 2), (1, 3)])) == [(2, 3)]
|
|
|
|
data1 = [{'cost': 1, 'currency': 'dollar'},
|
|
{'cost': 2, 'currency': 'dollar'}]
|
|
|
|
data2 = [{'cost': 100, 'currency': 'yen'},
|
|
{'cost': 300, 'currency': 'yen'}]
|
|
|
|
conversions = {'dollar': 1, 'yen': 0.01}
|
|
|
|
def indollars(item):
|
|
return conversions[item['currency']] * item['cost']
|
|
|
|
list(diff(data1, data2, key=indollars)) == [
|
|
({'cost': 2, 'currency': 'dollar'}, {'cost': 300, 'currency': 'yen'})]
|
|
|
|
|
|
def test_topk():
|
|
assert topk(2, [4, 1, 5, 2]) == (5, 4)
|
|
assert topk(2, [4, 1, 5, 2], key=lambda x: -x) == (1, 2)
|
|
assert topk(2, iter([5, 1, 4, 2]), key=lambda x: -x) == (1, 2)
|
|
|
|
assert topk(2, [{'a': 1, 'b': 10}, {'a': 2, 'b': 9},
|
|
{'a': 10, 'b': 1}, {'a': 9, 'b': 2}], key='a') == \
|
|
({'a': 10, 'b': 1}, {'a': 9, 'b': 2})
|
|
|
|
assert topk(2, [{'a': 1, 'b': 10}, {'a': 2, 'b': 9},
|
|
{'a': 10, 'b': 1}, {'a': 9, 'b': 2}], key='b') == \
|
|
({'a': 1, 'b': 10}, {'a': 2, 'b': 9})
|
|
assert topk(2, [(0, 4), (1, 3), (2, 2), (3, 1), (4, 0)], 0) == \
|
|
((4, 0), (3, 1))
|
|
|
|
|
|
def test_topk_is_stable():
|
|
assert topk(4, [5, 9, 2, 1, 5, 3], key=lambda x: 1) == (5, 9, 2, 1)
|
|
|
|
|
|
def test_peek():
|
|
alist = ["Alice", "Bob", "Carol"]
|
|
element, blist = peek(alist)
|
|
element == alist[0]
|
|
assert list(blist) == alist
|
|
|
|
assert raises(StopIteration, lambda: peek([]))
|
|
|
|
|
|
def test_random_sample():
|
|
alist = list(range(100))
|
|
|
|
assert list(random_sample(prob=1, seq=alist, random_state=2016)) == alist
|
|
|
|
mk_rsample = lambda rs=1: list(random_sample(prob=0.1,
|
|
seq=alist,
|
|
random_state=rs))
|
|
rsample1 = mk_rsample()
|
|
assert rsample1 == mk_rsample()
|
|
|
|
rsample2 = mk_rsample(1984)
|
|
randobj = Random(1984)
|
|
assert rsample2 == mk_rsample(randobj)
|
|
|
|
assert rsample1 != rsample2
|
|
|
|
assert mk_rsample(object) == mk_rsample(object)
|
|
assert mk_rsample(object) != mk_rsample(object())
|
|
assert mk_rsample(b"a") == mk_rsample(u"a")
|
|
|
|
assert raises(TypeError, lambda: mk_rsample([]))
|