forked from Rust-related/RustPython
48 lines
963 B
Python
48 lines
963 B
Python
from testutils import assert_raises
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a = []
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assert a[:] == []
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assert a[: 2 ** 100] == []
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assert a[-2 ** 100 :] == []
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assert a[:: 2 ** 100] == []
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assert a[10:20] == []
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assert a[-20:-10] == []
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b = [1, 2]
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assert b[:] == [1, 2]
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assert b[slice(None)] == [1, 2]
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assert b[: 2 ** 100] == [1, 2]
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assert b[-2 ** 100 :] == [1, 2]
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assert b[2 ** 100 :] == []
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assert b[:: 2 ** 100] == [1]
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assert b[-10:1] == [1]
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assert b[0:0] == []
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assert b[1:0] == []
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assert_raises(ValueError, lambda: b[::0], _msg='zero step slice')
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assert b[::-1] == [2, 1]
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assert b[1::-1] == [2, 1]
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assert b[0::-1] == [1]
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assert b[0:-5:-1] == [1]
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assert b[:0:-1] == [2]
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assert b[5:0:-1] == [2]
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c = list(range(10))
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assert c[9:6:-3] == [9]
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assert c[9::-3] == [9, 6, 3, 0]
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assert c[9::-4] == [9, 5, 1]
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assert c[8 :: -2 ** 100] == [8]
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assert c[7:7:-2] == []
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assert c[7:8:-2] == []
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d = "123456"
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assert d[3::-1] == "4321"
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assert d[4::-3] == "52"
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assert [1, 2, 3, 5, 6][-1:-5:-1] == [6, 5, 3, 2] # #746
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