/usr/lib/python2.7/test/test_xrange.py is in libpython2.7-testsuite 2.7.15~rc1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 | # Python test set -- built-in functions
import test.test_support, unittest
import sys
import pickle
import itertools
import warnings
warnings.filterwarnings("ignore", "integer argument expected",
DeprecationWarning, "unittest")
# pure Python implementations (3 args only), for comparison
def pyrange(start, stop, step):
if (start - stop) // step < 0:
# replace stop with next element in the sequence of integers
# that are congruent to start modulo step.
stop += (start - stop) % step
while start != stop:
yield start
start += step
def pyrange_reversed(start, stop, step):
stop += (start - stop) % step
return pyrange(stop - step, start - step, -step)
class XrangeTest(unittest.TestCase):
def assert_iterators_equal(self, xs, ys, test_id, limit=None):
# check that an iterator xs matches the expected results ys,
# up to a given limit.
if limit is not None:
xs = itertools.islice(xs, limit)
ys = itertools.islice(ys, limit)
sentinel = object()
pairs = itertools.izip_longest(xs, ys, fillvalue=sentinel)
for i, (x, y) in enumerate(pairs):
if x == y:
continue
elif x == sentinel:
self.fail('{}: iterator ended unexpectedly '
'at position {}; expected {}'.format(test_id, i, y))
elif y == sentinel:
self.fail('{}: unexpected excess element {} at '
'position {}'.format(test_id, x, i))
else:
self.fail('{}: wrong element at position {};'
'expected {}, got {}'.format(test_id, i, y, x))
def assert_xranges_equivalent(self, x, y):
# Check that two xrange objects are equivalent, in the sense of the
# associated sequences being the same. We want to use this for large
# xrange objects, so instead of converting to lists and comparing
# directly we do a number of indirect checks.
if len(x) != len(y):
self.fail('{} and {} have different '
'lengths: {} and {} '.format(x, y, len(x), len(y)))
if len(x) >= 1:
if x[0] != y[0]:
self.fail('{} and {} have different initial '
'elements: {} and {} '.format(x, y, x[0], y[0]))
if x[-1] != y[-1]:
self.fail('{} and {} have different final '
'elements: {} and {} '.format(x, y, x[-1], y[-1]))
if len(x) >= 2:
x_step = x[1] - x[0]
y_step = y[1] - y[0]
if x_step != y_step:
self.fail('{} and {} have different step: '
'{} and {} '.format(x, y, x_step, y_step))
def test_xrange(self):
self.assertEqual(list(xrange(3)), [0, 1, 2])
self.assertEqual(list(xrange(1, 5)), [1, 2, 3, 4])
self.assertEqual(list(xrange(0)), [])
self.assertEqual(list(xrange(-3)), [])
self.assertEqual(list(xrange(1, 10, 3)), [1, 4, 7])
self.assertEqual(list(xrange(5, -5, -3)), [5, 2, -1, -4])
a = 10
b = 100
c = 50
self.assertEqual(list(xrange(a, a+2)), [a, a+1])
self.assertEqual(list(xrange(a+2, a, -1L)), [a+2, a+1])
self.assertEqual(list(xrange(a+4, a, -2)), [a+4, a+2])
seq = list(xrange(a, b, c))
self.assertIn(a, seq)
self.assertNotIn(b, seq)
self.assertEqual(len(seq), 2)
seq = list(xrange(b, a, -c))
self.assertIn(b, seq)
self.assertNotIn(a, seq)
self.assertEqual(len(seq), 2)
seq = list(xrange(-a, -b, -c))
self.assertIn(-a, seq)
self.assertNotIn(-b, seq)
self.assertEqual(len(seq), 2)
self.assertRaises(TypeError, xrange)
self.assertRaises(TypeError, xrange, 1, 2, 3, 4)
self.assertRaises(ValueError, xrange, 1, 2, 0)
self.assertRaises(OverflowError, xrange, 10**100, 10**101, 10**101)
self.assertRaises(TypeError, xrange, 0, "spam")
self.assertRaises(TypeError, xrange, 0, 42, "spam")
self.assertEqual(len(xrange(0, sys.maxint, sys.maxint-1)), 2)
self.assertRaises(OverflowError, xrange, -sys.maxint, sys.maxint)
self.assertRaises(OverflowError, xrange, 0, 2*sys.maxint)
r = xrange(-sys.maxint, sys.maxint, 2)
self.assertEqual(len(r), sys.maxint)
self.assertRaises(OverflowError, xrange, -sys.maxint-1, sys.maxint, 2)
def test_pickling(self):
testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1),
(13, 21, 3), (-2, 2, 2)]
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
for t in testcases:
r = xrange(*t)
self.assertEqual(list(pickle.loads(pickle.dumps(r, proto))),
list(r))
M = min(sys.maxint, sys.maxsize)
large_testcases = testcases + [
(0, M, 1),
(M, 0, -1),
(0, M, M - 1),
(M // 2, M, 1),
(0, -M, -1),
(0, -M, 1 - M),
(-M, M, 2),
(-M, M, 1024),
(-M, M, 10585),
(M, -M, -2),
(M, -M, -1024),
(M, -M, -10585),
]
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
for t in large_testcases:
r = xrange(*t)
r_out = pickle.loads(pickle.dumps(r, proto))
self.assert_xranges_equivalent(r_out, r)
def test_repr(self):
# Check that repr of an xrange is a valid representation
# of that xrange.
# Valid xranges have at most min(sys.maxint, sys.maxsize) elements.
M = min(sys.maxint, sys.maxsize)
testcases = [
(13,),
(0, 11),
(-22, 10),
(20, 3, -1),
(13, 21, 3),
(-2, 2, 2),
(0, M, 1),
(M, 0, -1),
(0, M, M - 1),
(M // 2, M, 1),
(0, -M, -1),
(0, -M, 1 - M),
(-M, M, 2),
(-M, M, 1024),
(-M, M, 10585),
(M, -M, -2),
(M, -M, -1024),
(M, -M, -10585),
]
for t in testcases:
r = xrange(*t)
r_out = eval(repr(r))
self.assert_xranges_equivalent(r, r_out)
def test_range_iterators(self):
# see issue 7298
limits = [base + jiggle
for M in (2**32, 2**64)
for base in (-M, -M//2, 0, M//2, M)
for jiggle in (-2, -1, 0, 1, 2)]
test_ranges = [(start, end, step)
for start in limits
for end in limits
for step in (-2**63, -2**31, -2, -1, 1, 2)]
for start, end, step in test_ranges:
try:
iter1 = xrange(start, end, step)
except OverflowError:
pass
else:
iter2 = pyrange(start, end, step)
test_id = "xrange({}, {}, {})".format(start, end, step)
# check first 100 entries
self.assert_iterators_equal(iter1, iter2, test_id, limit=100)
try:
iter1 = reversed(xrange(start, end, step))
except OverflowError:
pass
else:
iter2 = pyrange_reversed(start, end, step)
test_id = "reversed(xrange({}, {}, {}))".format(start, end, step)
self.assert_iterators_equal(iter1, iter2, test_id, limit=100)
def test_main():
test.test_support.run_unittest(XrangeTest)
if __name__ == "__main__":
test_main()
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