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builtin_slice.py
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from testutils import assert_raises
a = slice(10)
assert a.start == None
assert a.stop == 10
assert a.step == None
a = slice(0, 10, 1)
assert a.start == 0
assert a.stop == 10
assert a.step == 1
assert slice(10).__repr__() == "slice(None, 10, None)"
assert slice(None).__repr__() == "slice(None, None, None)"
assert slice(0, 10, 13).__repr__() == "slice(0, 10, 13)"
assert slice("0", 1.1, 2 + 3j).__repr__() == "slice('0', 1.1, (2+3j))"
assert slice(10) == slice(10)
assert slice(-1) != slice(1)
assert slice(0, 10, 3) != slice(0, 11, 3)
assert slice(0, None, 3) != slice(0, "a", 3)
assert slice(0, "a", 3) == slice(0, "a", 3)
assert slice(0, 0, 0).__eq__(slice(0, 0, 0))
assert not slice(0, 0, 1).__eq__(slice(0, 0, 0))
assert not slice(0, 1, 0).__eq__(slice(0, 0, 0))
assert not slice(1, 0, 0).__eq__(slice(0, 0, 0))
assert slice(1, 0, 0).__ne__(slice(0, 0, 0))
assert slice(0, 1, 0).__ne__(slice(0, 0, 0))
assert slice(0, 0, 1).__ne__(slice(0, 0, 0))
assert slice(0).__eq__(0) == NotImplemented
assert slice(0).__ne__(0) == NotImplemented
assert slice(None).__ne__(slice(0))
# slice gt, ge, lt, le
assert_raises(TypeError, lambda: slice(0, slice(), 0) < slice(0, 0, 0))
assert_raises(TypeError, lambda: slice(0, slice(), 0) <= slice(0, 0, 0))
assert_raises(TypeError, lambda: slice(0, slice(), 0) > slice(0, 0, 0))
assert_raises(TypeError, lambda: slice(0, slice(), 0) >= slice(0, 0, 0))
assert_raises(TypeError, lambda: slice(0, 0, 0) < slice(0, 0, slice()))
assert_raises(TypeError, lambda: slice(0, 0, 0) <= slice(0, 0, slice()))
assert_raises(TypeError, lambda: slice(0, 0, 0) > slice(0, 0, slice()))
assert_raises(TypeError, lambda: slice(0, 0, 0) >= slice(0, 0, slice()))
assert_raises(TypeError, lambda: slice(0, 0) >= slice(0, 0, 0))
assert_raises(TypeError, lambda: slice(0, 0) <= slice(0, 0, 0))
assert_raises(TypeError, lambda: slice(0, 0) < slice(0, 0, 0))
assert_raises(TypeError, lambda: slice(0, 0) > slice(0, 0, 0))
assert slice(0, 0, 0) < slice(0, 1, -1)
assert slice(0, 0, 0) < slice(0, 0, 1)
assert slice(0, 0, 0) > slice(0, 0, -1)
assert slice(0, 0, 0) >= slice(0, 0, -1)
assert not slice(0, 0, 0) <= slice(0, 0, -1)
assert slice(0, 0, 0) > slice(0, -1, 1)
assert slice(0, 0, 0) >= slice(0, -1, 1)
assert slice(0, 0, 0) >= slice(0, -1, 1)
assert slice(0, 0, 0) <= slice(0, 0, 1)
assert slice(0, 0, 0) <= slice(0, 0, 0)
assert slice(0, 0, 0) <= slice(0, 0, 0)
assert not slice(0, 0, 0) > slice(0, 0, 0)
assert not slice(0, 0, 0) < slice(0, 0, 0)
assert not slice(0, float("nan"), float("nan")) <= slice(0, float("nan"), 1)
assert not slice(0, float("nan"), float("nan")) <= slice(0, float("nan"), float("nan"))
assert not slice(0, float("nan"), float("nan")) >= slice(0, float("nan"), float("nan"))
assert not slice(0, float("nan"), float("nan")) < slice(0, float("nan"), float("nan"))
assert not slice(0, float("nan"), float("nan")) > slice(0, float("nan"), float("nan"))
assert slice(0, float("inf"), float("inf")) >= slice(0, float("inf"), 1)
assert slice(0, float("inf"), float("inf")) <= slice(0, float("inf"), float("inf"))
assert slice(0, float("inf"), float("inf")) >= slice(0, float("inf"), float("inf"))
assert not slice(0, float("inf"), float("inf")) < slice(0, float("inf"), float("inf"))
assert not slice(0, float("inf"), float("inf")) > slice(0, float("inf"), float("inf"))
assert_raises(TypeError, lambda: slice(0) < 3)
assert_raises(TypeError, lambda: slice(0) > 3)
assert_raises(TypeError, lambda: slice(0) <= 3)
assert_raises(TypeError, lambda: slice(0) >= 3)
assert slice(None).indices(10) == (0, 10, 1)
assert slice(None, None, 2).indices(10) == (0, 10, 2)
assert slice(1, None, 2).indices(10) == (1, 10, 2)
assert slice(None, None, -1).indices(10) == (9, -1, -1)
assert slice(None, None, -2).indices(10) == (9, -1, -2)
assert slice(3, None, -2).indices(10) == (3, -1, -2)
# issue 3004 tests
assert slice(None, -9).indices(10) == (0, 1, 1)
assert slice(None, -10).indices(10) == (0, 0, 1)
assert slice(None, -11).indices(10) == (0, 0, 1)
assert slice(None, -10, -1).indices(10) == (9, 0, -1)
assert slice(None, -11, -1).indices(10) == (9, -1, -1)
assert slice(None, -12, -1).indices(10) == (9, -1, -1)
assert slice(None, 9).indices(10) == (0, 9, 1)
assert slice(None, 10).indices(10) == (0, 10, 1)
assert slice(None, 11).indices(10) == (0, 10, 1)
assert slice(None, 8, -1).indices(10) == (9, 8, -1)
assert slice(None, 9, -1).indices(10) == (9, 9, -1)
assert slice(None, 10, -1).indices(10) == (9, 9, -1)
assert slice(-100, 100).indices(10) == slice(None).indices(10)
assert slice(100, -100, -1).indices(10) == slice(None, None, -1).indices(10)
assert slice(-100, 100, 2).indices(10) == (0, 10, 2)
try:
slice(None, None, 0)
assert "zero step" == "throws an exception"
except:
pass
a = []
b = [1, 2]
c = list(range(10))
d = "123456"
slice_a = slice(5)
assert slice_a.start is None
assert slice_a.stop == 5
assert slice_a.step is None
slice_b = slice(1, 5)
assert slice_b.start == 1
assert slice_b.stop == 5
assert slice_b.step is None
slice_c = slice(1, 5, 2)
assert slice_c.start == 1
assert slice_c.stop == 5
assert slice_c.step == 2
a = object()
slice_d = slice(a, "v", 1.0)
assert slice_d.start is a
assert slice_d.stop == "v"
assert slice_d.step == 1.0
class SubScript(object):
def __getitem__(self, item):
assert type(item) == slice
def __setitem__(self, key, value):
assert type(key) == slice
ss = SubScript()
_ = ss[:]
ss[:1] = 1
class CustomIndex:
def __init__(self, x):
self.x = x
def __index__(self):
return self.x
assert c[CustomIndex(1) : CustomIndex(3)] == [1, 2]
assert d[CustomIndex(1) : CustomIndex(3)] == "23"
def test_all_slices():
"""
test all possible slices except big number
"""
mod = __import__("cpython_generated_slices")
ll = mod.LL
start = mod.START
end = mod.END
step = mod.STEP
slices_res = mod.SLICES_RES
count = 0
failures = []
for s in start:
for e in end:
for t in step:
lhs = ll[s:e:t]
try:
assert lhs == slices_res[count]
except AssertionError:
failures.append(
"start: {} ,stop: {}, step {}. Expected: {}, found: {}".format(
s, e, t, lhs, slices_res[count]
)
)
count += 1
if failures:
for f in failures:
print(f)
print(len(failures), "slices failed")
test_all_slices()