RustPython_RustPython/tests/snippets/builtin_slice.py at function_attributes · puwei0000/RustPython_RustPython · GitHub

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from testutils import assert_raises

a = []
assert a[:] == []
assert a[:2**100] == []
assert a[-2**100:] == []
assert a[::2**100] == []
assert a[10:20] == []
assert a[-20:-10] == []

b = [1, 2]

assert b[:] == [1, 2]
assert b[:2**100] == [1, 2]
assert b[-2**100:] == [1, 2]
assert b[2**100:] == []
assert b[::2**100] == [1]
assert b[-10:1] == [1]
assert b[0:0] == []
assert b[1:0] == []

assert_raises(ValueError, lambda: b[::0], 'zero step slice')

assert b[::-1] == [2, 1]
assert b[1::-1] == [2, 1]
assert b[0::-1] == [1]
assert b[0:-5:-1] == [1]
assert b[:0:-1] == [2]
assert b[5:0:-1] == [2]

c = list(range(10))

assert c[9:6:-3] == [9]
assert c[9::-3] == [9, 6, 3, 0]
assert c[9::-4] == [9, 5, 1]
assert c[8::-2**100] == [8]

assert c[7:7:-2] == []
assert c[7:8:-2] == []

d = "123456"

assert d[3::-1] == "4321"
assert d[4::-3] == "52"


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


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