def test_index(self):
ss = SortedSet({
'one': 1,
'two': 2,
})
self.assertEqual(ss.index('two'), 1)
self.assertEqual(ss.index('one'), 0)
def test_index(self):
ss = SortedSet({
'one': 1,
'two': 2,
})
self.assertEqual(ss.index('two'), 1)
self.assertEqual(ss.index('one'), 0)
def test_items(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
self.assertEqual(list(ss.items()), [
('one', 1),
('two', 2),
])
def test_items(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
self.assertEqual(list(ss.items()), [
('one', 1),
('two', 2),
])
def test_negative(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = -2
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['two'], -2)
self.assertEqual(list(ss), ['two', 'one'])
self.assertEqual(ss.index('two'), 0)
self.assertEqual(ss.index('one'), 1)
def test_negative(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = -2
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['two'], -2)
self.assertEqual(list(ss), ['two', 'one'])
self.assertEqual(ss.index('two'), 0)
self.assertEqual(ss.index('one'), 1)
def test_keys(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
self.assertEqual(list(ss), [
'one',
'two',
])
self.assertEqual(list(ss.keys()), [
'one',
'two',
])
def test_keys(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
self.assertEqual(list(ss), [
'one',
'two',
])
self.assertEqual(list(ss.keys()), [
'one',
'two',
])
def test_key_by_index(self):
ss = SortedSet({
'one': 1,
'two': 2,
})
self.assertEqual(ss.by_index[1], 'two')
self.assertEqual(ss.by_index[0], 'one')
def test_delete(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
ss['three'] = 3
del ss['two']
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['three'], 3)
self.assertEqual(list(ss), ['one', 'three'])
def test_fractions(self):
ss = SortedSet()
# we use values that have exact representation as floating point number
ss['one'] = fractions.Fraction(1, 2)
ss['two'] = fractions.Fraction(2, 3)
ss['three'] = fractions.Fraction(-3, 2)
self.assertEqual(ss['one'], fractions.Fraction(1, 2))
self.assertEqual(ss['two'], fractions.Fraction(2, 3))
self.assertEqual(ss['three'], fractions.Fraction(-3, 2))
self.assertEqual(list(ss), ['three', 'one', 'two'])
def test_floats(self):
ss = SortedSet()
# we use values that have exact representation as floating point number
ss['one'] = 1.25
ss['two'] = 1.5
ss['three'] = -3.0
self.assertEqual(ss['one'], 1.25)
self.assertEqual(ss['two'], 1.5)
self.assertEqual(ss['three'], -3.0)
self.assertEqual(list(ss), ['three', 'one', 'two'])
def test_delete_all_cases(self):
for levels in product(range(1, 4), range(1, 4), range(1, 4)):
# delete middle
ss = SortedSet()
with patch('sortedsets._random_level', side_effect=levels) as p:
ss['one'] = 1
ss['two'] = 2
ss['three'] = 3
del ss['two']
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['three'], 3)
with self.assertRaises(KeyError):
ss['two']
self.assertEqual(list(ss), ['one', 'three'])
ss.clear()
self.assertEqual(list(ss), [])
# delete first
ss = SortedSet()
with patch('sortedsets._random_level', side_effect=levels) as p:
ss['one'] = 1
ss['two'] = 2
ss['three'] = 3
del ss['one']
self.assertEqual(ss['two'], 2)
self.assertEqual(ss['three'], 3)
with self.assertRaises(KeyError):
ss['one']
self.assertEqual(list(ss), ['two', 'three'])
ss.clear()
self.assertEqual(list(ss), [])
# delete last
ss = SortedSet()
with patch('sortedsets._random_level', side_effect=levels) as p:
ss['one'] = 1
ss['two'] = 2
ss['three'] = 3
del ss['three']
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['two'], 2)
with self.assertRaises(KeyError):
ss['three']
self.assertEqual(list(ss), ['one', 'two'])
ss.clear()
self.assertEqual(list(ss), [])
def test(size):
tm = clock()
ss = SortedSet((str(i), i * 10) for i in range(size))
create_time = clock() - tm
print("SORTED SET WITH", size, "ELEMENTS", ss._level, "LEVELS")
print("Memory usage", resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)
print("Creation time ", format(create_time, '10.2f'), "s")
num = 1000
step = size // (num + 2)
items = []
for i in range(step, size - step, step):
items.append((str(i), i * 10))
tm = clock()
for k, v in items:
del ss[k]
del_time = num / (clock() - tm)
tm = clock()
for k, v in items:
ss[k] = v
ins_time = num / (clock() - tm)
print("Insertion speed", format(ins_time, '10.2f'), "ins/s")
print("Deletion speed ", format(del_time, '10.2f'), "del/s")
def test_simple(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['two'], 2)
def test_repr(self):
ss = SortedSet({
'one': 1,
'two': 2,
})
self.assertEqual(repr(ss), "<SortedSet {'one': 1, 'two': 2}>")
def test_slice_by_score(self):
data = {
'one': 1,
'two1': 2,
'two2': 2,
'two3': 2,
'three': 3,
}
ss = SortedSet(data)
self.assertEqual(ss.by_score[:], SortedSet(data))
self.assertEqual(ss.by_score[1:], SortedSet(data))
self.assertEqual(ss.by_score[1:4], SortedSet(data))
self.assertEqual(ss.by_score[:4], SortedSet(data))
tmp = data.copy()
del tmp['one']
self.assertEqual(ss.by_score[1.5:], SortedSet(tmp))
self.assertEqual(ss.by_score[2:], SortedSet(tmp))
self.assertEqual(ss.by_score[2:4], SortedSet(tmp))
self.assertEqual(ss.by_score[1.5:4], SortedSet(tmp))
self.assertEqual(ss.by_score[1.5:3.1], SortedSet(tmp))
tmp = data.copy()
del tmp['three']
self.assertEqual(ss.by_score[0.5:3], SortedSet(tmp))
self.assertEqual(ss.by_score[0.5:2.5], SortedSet(tmp))
self.assertEqual(ss.by_score[:2.5], SortedSet(tmp))
self.assertEqual(ss.by_score[:3], SortedSet(tmp))
self.assertEqual(ss.by_score[:2.01], SortedSet(tmp))
del tmp['one']
self.assertEqual(ss.by_score[1.01:2.01], SortedSet(tmp))
self.assertEqual(ss.by_score[1.99:2.01], SortedSet(tmp))
self.assertEqual(ss.by_score[2:2.01], SortedSet(tmp))
self.assertEqual(ss.by_score[2:2.99], SortedSet(tmp))
self.assertEqual(ss.by_score[2.01:2.99], SortedSet())
self.assertEqual(ss.by_score[:2], SortedSet({'one': 1}))
self.assertEqual(ss.by_score[:1.01], SortedSet({'one': 1}))
self.assertEqual(ss.by_score[:1.99], SortedSet({'one': 1}))
self.assertEqual(ss.by_score[3:], SortedSet({'three': 3}))
self.assertEqual(ss.by_score[2.01:], SortedSet({'three': 3}))
self.assertEqual(ss.by_score[2.99:], SortedSet({'three': 3}))
self.assertEqual(ss.by_score[3.01:], SortedSet())
self.assertEqual(
ss.by_score[fractions.Fraction(4 / 3):fractions.Fraction(7 / 3)],
SortedSet({
'two1': 2,
'two2': 2,
'two3': 2
}))
def test_values(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
self.assertEqual(list(ss.values()), [1, 2])
def test_delete_all_cases(self):
for levels in product(range(1, 4), range(1, 4), range(1, 4)):
# delete middle
ss = SortedSet()
with patch('sortedsets._random_level', side_effect=levels) as p:
ss['one'] = 1
ss['two'] = 2
ss['three'] = 3
del ss['two']
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['three'], 3)
with self.assertRaises(KeyError):
ss['two']
self.assertEqual(list(ss), ['one', 'three'])
ss.clear()
self.assertEqual(list(ss), [])
# delete first
ss = SortedSet()
with patch('sortedsets._random_level', side_effect=levels) as p:
ss['one'] = 1
ss['two'] = 2
ss['three'] = 3
del ss['one']
self.assertEqual(ss['two'], 2)
self.assertEqual(ss['three'], 3)
with self.assertRaises(KeyError):
ss['one']
self.assertEqual(list(ss), ['two', 'three'])
ss.clear()
self.assertEqual(list(ss), [])
# delete last
ss = SortedSet()
with patch('sortedsets._random_level', side_effect=levels) as p:
ss['one'] = 1
ss['two'] = 2
ss['three'] = 3
del ss['three']
self.assertEqual(ss['one'], 1)
self.assertEqual(ss['two'], 2)
with self.assertRaises(KeyError):
ss['three']
self.assertEqual(list(ss), ['one', 'two'])
ss.clear()
self.assertEqual(list(ss), [])
def test_insert_integers(self):
items = [ # fifty random values
('Xe2W0QxllGdCW251l7U9Dg', 150),
('3HT/SVSdCwM+4ZjtSqHCew', 476),
('Q2BKuEOFwIojkPsnjmPNFg', 2390),
('Qjq1fGnHVc5nXvWnbEyXjQ', 3773),
('wamjIdfm+ajk81fR7gKcAA', 4729),
('uDUHFv5CtiY/Gm5LOCfGUg', 6143),
('78l934GXETN68sql2vjP5w', 6487),
('1LAwgvIO0tEikYySkaSaXw', 7449),
('Y4mDqz7LfIV4L8h2aUwAkA', 10234),
('AidPceym19y/lmIdi6JxQQ', 10779),
('hHqwNSMusq7O895yFkr+rQ', 10789),
('dg16QiUDC2rgE39FWTSOxg', 11873),
('sgAdgtQ5wRFGSOZ3xZYHyA', 12273),
('OACKY0A1ftBbyLvTzyf8lQ', 12776),
('f+dLA1jK8EFEAHxm1FKUkA', 13079),
('1uDN4mSmsEQF/o6VNiBl3g', 13147),
('nNwOvGfk9AH2tIzK8uNdzQ', 16636),
('tMUZ6A1e/1SKd3ko0FhhBQ', 17933),
('M77ZQiFlYeU4ySUtVa6XYg', 18570),
('fY7RKQu8toBxoug4CMmznA', 18711),
('UaZorA+/GnCL4nmgLs3c/g', 19968),
('VbXaOsRHqH2CAoNJiYsrqg', 20064),
('dAr84/axpItIAjjNcVPzHA', 20250),
('HjzS0QlpofFhDO2iU4mXAw', 20756),
('ipksmQaeYErYwjZ6ia46TA', 21084),
('XemDsutAYPpCZ6WY4M//ig', 21609),
('6U6fbOs8jYVfqWeArQ5HHQ', 22410),
('QFblGefWYZqFbuSK0SDPRQ', 23267),
('J13bR75czCiLfeBcIy4XTg', 26556),
('e6XlDT9h6GVPdfvBOrXW5Q', 26608),
('/eLYo+GKgAt7I2PrOrFTzQ', 28597),
('48W/xF+VIQZoyKlhktifMw', 31364),
('NTUtbi4YOHiNIV6SVrpwyg', 33709),
('364+KUYYuwlmezv1EvaE0g', 33945),
('YaD6Ktqw1iIWcFGgMEvMxg', 38248),
('cJSZfsidFuaMK9jY15g44A', 38668),
('UeP/HvscsnQXUK37Dyo8/w', 40861),
('xon2bN9ZToI4LpN4o7M2nQ', 41836),
('MQKXJCNNtWsRqoGbSaDorw', 47171),
('LCcqUwfmOFq+VXI2kGBQow', 49311),
('gMXF4DMHCWBjbgucOqWKQg', 50725),
('JKHDvGMcLQrR4G3zC2g9ug', 50875),
('Mp1feZZmnmMPJk8bGv0NaA', 51017),
('rhZyspOoakQBO9Ses3jl+A', 53781),
('JB9bMHKHoT+hMVjuBrbqlg', 56409),
('/DsgGH+7F6Fh2/81SzyXYA', 56512),
('InjjAuUMGHYUIRdRnkUw2w', 56903),
('otVFi6DLAO+v7XUAcmKttA', 57114),
('mVTvHObgjfzvZLOzl/xo2Q', 58550),
('uU1yLoXCgPtifROhCST0sA', 60267)]
keys = list(map(itemgetter(0), items))
values = list(map(itemgetter(1), items))
# simple checks
set_n = SortedSet(items)
set_r = SortedSet(reversed(items))
for cur in (set_n, set_r):
self.assertEqual(list(cur), keys)
self.assertEqual(list(cur.keys()), keys)
self.assertEqual(list(cur.values()), values)
self.assertEqual(list(cur.items()), items)
for idx in range(len(items)):
key, score = items[idx]
self.assertEqual(set_n.index(key), idx)
self.assertEqual(set_r.index(key), idx)
self.assertEqual(set_n.by_index[idx], key)
self.assertEqual(set_r.by_index[idx], key)
# slicing by index should be same as slicing list
ends = (None, 0, 2, 5, 10, 49, 50, 51, -1, -2, -5, -10, -49, 50, -51)
steps = (1, 2, 3)
for start, stop, step in product(ends, ends, steps):
self.assertEqual(list(set_n.by_index[start:stop:step].items()),
items[start:stop:step])
self.assertEqual(list(set_r.by_index[start:stop:step].items()),
items[start:stop:step])
# let's try to delete and reinsert slice
for start, stop in product(ends, ends):
slc = set_r.by_index[start:stop]
slclist = items[start:stop]
self.assertEqual(list(slc.items()), slclist)
# delete a slice from set and list, then compare
del set_r.by_index[start:stop]
tmp = items[:]
del tmp[start:stop]
self.assertEqual(list(set_r.items()), tmp)
# let's recreate set and check
set_r.update(slc)
self.assertEqual(list(set_r.items()), items)
# try score slice on reverted set
if slclist:
# can do this only if set is not empty
scorestart = slclist[0][1]
scorestop = slclist[-1][1] + 1
slc2 = set_r.by_score[scorestart:scorestop]
self.assertEqual(list(slc2.items()), slclist)
del set_r.by_score[scorestart:scorestop]
self.assertEqual(list(set_r.items()), tmp)
# and revert this change back again
set_r.update(slc2)
self.assertEqual(list(set_r.items()), items)
# Lets test 7 random insertion orders
for i in (10, 20, 30, 40, 50, 60, 70):
rnd = random.Random(i)
to_insert = copy.copy(items)
rnd.shuffle(to_insert)
# Let's check several sets created with different methods
set1 = SortedSet()
for k, v in to_insert:
set1[k] = v
set2 = SortedSet(to_insert)
set3 = SortedSet(set1)
set4 = SortedSet(set2)
# Check all of them
cursets = (set1, set2, set3, set4)
for cur in cursets:
self.assertEqual(list(cur), keys)
self.assertEqual(list(cur.keys()), keys)
self.assertEqual(list(cur.values()), values)
self.assertEqual(list(cur.items()), items)
# Check equality of all combinations
all_sets = (set_n, set_r, set1, set2, set3, set4)
for s1, s2 in combinations(all_sets, 2):
self.assertEqual(s1, s2)
# Let's pick up items to delete
left = copy.copy(items)
to_delete = []
for i in range(rnd.randrange(10, 30)):
idx = random.randrange(len(left))
to_delete.append(left[idx])
del left[idx]
# Let's test deletion
for cur in cursets:
rnd.shuffle(to_delete)
for key, value in to_delete:
del cur[key]
self.assertEqual(list(cur.items()), left)
self.assertNotEqual(cur, set_n)
self.assertNotEqual(cur, set_r)
# Let's reinsert keys in random order, and check if it's still ok
for cur in cursets:
rnd.shuffle(to_delete)
for key, value in to_delete:
cur[key] = value
self.assertEqual(cur, set_n)
self.assertEqual(cur, set_r)
self.assertEqual(list(cur.items()), items)
for idx in range(len(items)):
key, score = items[idx]
self.assertEqual(cur.index(key), idx)
self.assertEqual(cur.by_index[idx], key)
def test_insert_integers(self):
items = [ # fifty random values
('Xe2W0QxllGdCW251l7U9Dg', 150), ('3HT/SVSdCwM+4ZjtSqHCew', 476),
('Q2BKuEOFwIojkPsnjmPNFg', 2390), ('Qjq1fGnHVc5nXvWnbEyXjQ', 3773),
('wamjIdfm+ajk81fR7gKcAA', 4729), ('uDUHFv5CtiY/Gm5LOCfGUg', 6143),
('78l934GXETN68sql2vjP5w', 6487), ('1LAwgvIO0tEikYySkaSaXw', 7449),
('Y4mDqz7LfIV4L8h2aUwAkA', 10234), ('AidPceym19y/lmIdi6JxQQ',
10779),
('hHqwNSMusq7O895yFkr+rQ', 10789), ('dg16QiUDC2rgE39FWTSOxg',
11873),
('sgAdgtQ5wRFGSOZ3xZYHyA', 12273), ('OACKY0A1ftBbyLvTzyf8lQ',
12776),
('f+dLA1jK8EFEAHxm1FKUkA', 13079), ('1uDN4mSmsEQF/o6VNiBl3g',
13147),
('nNwOvGfk9AH2tIzK8uNdzQ', 16636), ('tMUZ6A1e/1SKd3ko0FhhBQ',
17933),
('M77ZQiFlYeU4ySUtVa6XYg', 18570), ('fY7RKQu8toBxoug4CMmznA',
18711),
('UaZorA+/GnCL4nmgLs3c/g', 19968), ('VbXaOsRHqH2CAoNJiYsrqg',
20064),
('dAr84/axpItIAjjNcVPzHA', 20250), ('HjzS0QlpofFhDO2iU4mXAw',
20756),
('ipksmQaeYErYwjZ6ia46TA', 21084), ('XemDsutAYPpCZ6WY4M//ig',
21609),
('6U6fbOs8jYVfqWeArQ5HHQ', 22410),
('QFblGefWYZqFbuSK0SDPRQ', 23267), ('J13bR75czCiLfeBcIy4XTg',
26556),
('e6XlDT9h6GVPdfvBOrXW5Q', 26608), ('/eLYo+GKgAt7I2PrOrFTzQ',
28597),
('48W/xF+VIQZoyKlhktifMw', 31364), ('NTUtbi4YOHiNIV6SVrpwyg',
33709),
('364+KUYYuwlmezv1EvaE0g', 33945), ('YaD6Ktqw1iIWcFGgMEvMxg',
38248),
('cJSZfsidFuaMK9jY15g44A', 38668), ('UeP/HvscsnQXUK37Dyo8/w',
40861),
('xon2bN9ZToI4LpN4o7M2nQ', 41836), ('MQKXJCNNtWsRqoGbSaDorw',
47171),
('LCcqUwfmOFq+VXI2kGBQow', 49311), ('gMXF4DMHCWBjbgucOqWKQg',
50725),
('JKHDvGMcLQrR4G3zC2g9ug', 50875), ('Mp1feZZmnmMPJk8bGv0NaA',
51017),
('rhZyspOoakQBO9Ses3jl+A', 53781), ('JB9bMHKHoT+hMVjuBrbqlg',
56409),
('/DsgGH+7F6Fh2/81SzyXYA', 56512), ('InjjAuUMGHYUIRdRnkUw2w',
56903),
('otVFi6DLAO+v7XUAcmKttA', 57114), ('mVTvHObgjfzvZLOzl/xo2Q',
58550),
('uU1yLoXCgPtifROhCST0sA', 60267)
]
keys = list(map(itemgetter(0), items))
values = list(map(itemgetter(1), items))
# simple checks
set_n = SortedSet(items)
set_r = SortedSet(reversed(items))
for cur in (set_n, set_r):
self.assertEqual(list(cur), keys)
self.assertEqual(list(cur.keys()), keys)
self.assertEqual(list(cur.values()), values)
self.assertEqual(list(cur.items()), items)
for idx in range(len(items)):
key, score = items[idx]
self.assertEqual(set_n.index(key), idx)
self.assertEqual(set_r.index(key), idx)
self.assertEqual(set_n.by_index[idx], key)
self.assertEqual(set_r.by_index[idx], key)
# slicing by index should be same as slicing list
ends = (None, 0, 2, 5, 10, 49, 50, 51, -1, -2, -5, -10, -49, 50, -51)
steps = (1, 2, 3)
for start, stop, step in product(ends, ends, steps):
self.assertEqual(list(set_n.by_index[start:stop:step].items()),
items[start:stop:step])
self.assertEqual(list(set_r.by_index[start:stop:step].items()),
items[start:stop:step])
# let's try to delete and reinsert slice
for start, stop in product(ends, ends):
slc = set_r.by_index[start:stop]
slclist = items[start:stop]
self.assertEqual(list(slc.items()), slclist)
# delete a slice from set and list, then compare
del set_r.by_index[start:stop]
tmp = items[:]
del tmp[start:stop]
self.assertEqual(list(set_r.items()), tmp)
# let's recreate set and check
set_r.update(slc)
self.assertEqual(list(set_r.items()), items)
# try score slice on reverted set
if slclist:
# can do this only if set is not empty
scorestart = slclist[0][1]
scorestop = slclist[-1][1] + 1
slc2 = set_r.by_score[scorestart:scorestop]
self.assertEqual(list(slc2.items()), slclist)
del set_r.by_score[scorestart:scorestop]
self.assertEqual(list(set_r.items()), tmp)
# and revert this change back again
set_r.update(slc2)
self.assertEqual(list(set_r.items()), items)
# Lets test 7 random insertion orders
for i in (10, 20, 30, 40, 50, 60, 70):
rnd = random.Random(i)
to_insert = copy.copy(items)
rnd.shuffle(to_insert)
# Let's check several sets created with different methods
set1 = SortedSet()
for k, v in to_insert:
set1[k] = v
set2 = SortedSet(to_insert)
set3 = SortedSet(set1)
set4 = SortedSet(set2)
# Check all of them
cursets = (set1, set2, set3, set4)
for cur in cursets:
self.assertEqual(list(cur), keys)
self.assertEqual(list(cur.keys()), keys)
self.assertEqual(list(cur.values()), values)
self.assertEqual(list(cur.items()), items)
# Check equality of all combinations
all_sets = (set_n, set_r, set1, set2, set3, set4)
for s1, s2 in combinations(all_sets, 2):
self.assertEqual(s1, s2)
# Let's pick up items to delete
left = copy.copy(items)
to_delete = []
for i in range(rnd.randrange(10, 30)):
idx = random.randrange(len(left))
to_delete.append(left[idx])
del left[idx]
# Let's test deletion
for cur in cursets:
rnd.shuffle(to_delete)
for key, value in to_delete:
del cur[key]
self.assertEqual(list(cur.items()), left)
self.assertNotEqual(cur, set_n)
self.assertNotEqual(cur, set_r)
# Let's reinsert keys in random order, and check if it's still ok
for cur in cursets:
rnd.shuffle(to_delete)
for key, value in to_delete:
cur[key] = value
self.assertEqual(cur, set_n)
self.assertEqual(cur, set_r)
self.assertEqual(list(cur.items()), items)
for idx in range(len(items)):
key, score = items[idx]
self.assertEqual(cur.index(key), idx)
self.assertEqual(cur.by_index[idx], key)
def test_values(self):
ss = SortedSet()
ss['one'] = 1
ss['two'] = 2
self.assertEqual(list(ss.values()), [1, 2])
def test_slice_by_index(self):
data = {
'one': 1,
'two': 2,
}
ss = SortedSet(data)
self.assertEqual(ss.by_index[:], SortedSet(data))
self.assertEqual(ss.by_index[1:], SortedSet({'two': 2}))
self.assertEqual(ss.by_index[2:], SortedSet())
self.assertEqual(ss.by_index[3:], SortedSet())
self.assertEqual(ss.by_index[:-1], SortedSet({'one': 1}))
self.assertEqual(ss.by_index[:-2], SortedSet())
self.assertEqual(ss.by_index[:-3], SortedSet())
self.assertEqual(ss.by_index[:-4], SortedSet())
with self.assertRaises(ValueError):
ss.by_index[::0]
with self.assertRaises(ValueError):
ss.by_index[::-1]
with self.assertRaises(ValueError):
ss.by_index[::-2]
ss = SortedSet(data)
del ss.by_index[:]
self.assertEqual(ss, SortedSet())
ss = SortedSet(data)
del ss.by_index[1:]
self.assertEqual(ss, SortedSet({'one': 1}))
ss = SortedSet(data)
del ss.by_index[:-1]
self.assertEqual(ss, SortedSet({'two': 2}))
