| # Without step |
| assert_eq([0, 1, 2, 3][0:-1], [0, 1, 2]) |
| assert_eq([0, 1, 2, 3, 4, 5][2:4], [2, 3]) |
| assert_eq([0, 1, 2, 3, 4, 5][-2:-1], [4]) |
| assert_eq([][1:2], []) |
| assert_eq([0, 1, 2, 3][-10:10], [0, 1, 2, 3]) |
| |
| # With step |
| assert_eq([1, 2, 3, 4, 5][::1], [1, 2, 3, 4, 5]) |
| assert_eq([1, 2, 3, 4, 5][1::1], [2, 3, 4, 5]) |
| assert_eq([1, 2, 3, 4, 5][:2:1], [1, 2]) |
| assert_eq([1, 2, 3, 4, 5][1:3:1], [2, 3]) |
| assert_eq([1, 2, 3, 4, 5][-4:-2:1], [2, 3]) |
| assert_eq([1, 2, 3, 4, 5][-10:10:1], [1, 2, 3, 4, 5]) |
| assert_eq([1, 2, 3, 4, 5][::42], [1]) |
| assert_eq([][::1], []) |
| assert_eq([][::-1], []) |
| assert_eq([1, 2, 3, 4, 5, 6, 7][::3], [1, 4, 7]) |
| assert_eq([1, 2, 3, 4, 5, 6, 7, 8, 9][1:7:3], [2, 5]) |
| assert_eq([1, 2, 3][3:1:1], []) |
| assert_eq([1, 2, 3][1:3:-1], []) |
| |
| # Negative step |
| assert_eq([1, 2, 3, 4, 5][::-1], [5, 4, 3, 2, 1]) |
| assert_eq([1, 2, 3, 4, 5][4::-1], [5, 4, 3, 2, 1]) |
| assert_eq([1, 2, 3, 4, 5][:0:-1], [5, 4, 3, 2]) |
| assert_eq([1, 2, 3, 4, 5][3:1:-1], [4, 3]) |
| assert_eq([1, 2, 3, 4, 5][::-2], [5, 3, 1]) |
| assert_eq([1, 2, 3, 4, 5][::-10], [5]) |
| |
| # None |
| assert_eq([1, 2, 3][None:None:None], [1, 2, 3]) |
| assert_eq([1, 2, 3][None:None], [1, 2, 3]) |
| assert_eq([1, 2, 3][None:2:None], [1, 2]) |
| |
| # Tuples |
| assert_eq(()[1:2], ()) |
| assert_eq(()[::1], ()) |
| assert_eq((0, 1, 2, 3)[0:-1], (0, 1, 2)) |
| assert_eq((0, 1, 2, 3, 4, 5)[2:4], (2, 3)) |
| assert_eq((0, 1, 2, 3)[-10:10], (0, 1, 2, 3)) |
| assert_eq((1, 2, 3, 4, 5)[-10:10:1], (1, 2, 3, 4, 5)) |
| assert_eq((1, 2, 3, 4, 5, 6, 7, 8, 9)[1:7:3], (2, 5)) |
| assert_eq((1, 2, 3, 4, 5)[::-1], (5, 4, 3, 2, 1)) |
| assert_eq((1, 2, 3, 4, 5)[3:1:-1], (4, 3)) |
| assert_eq((1, 2, 3, 4, 5)[::-2], (5, 3, 1)) |
| assert_eq((1, 2, 3, 4, 5)[::-10], (5,)) |
| |
| # index |
| assert_eq(['a', 'b', 'c', 'd'][0], 'a') |
| assert_eq(['a', 'b', 'c', 'd'][1], 'b') |
| assert_eq(['a', 'b', 'c', 'd'][-1], 'd') |
| assert_eq(['a', 'b', 'c', 'd'][-2], 'c') |
| assert_eq([0, 1, 2][-3], 0) |
| assert_eq([0, 1, 2][-2], 1) |
| assert_eq([0, 1, 2][-1], 2) |
| assert_eq([0, 1, 2][0], 0) |
| |
| |
| # list.index |
| bananas = ["b", "a", "n", "a", "n", "a", "s"] |
| assert_eq(bananas.index("a"), 1) # bAnanas |
| bananas.index("d") ### not found in list |
| --- |
| bananas = ["b", "a", "n", "a", "n", "a", "s"] |
| |
| # start |
| assert_eq(bananas.index("a", -1000), 1) # bAnanas |
| assert_eq(bananas.index("a", 0), 1) # bAnanas |
| assert_eq(bananas.index("a", 1), 1) # bAnanas |
| assert_eq(bananas.index("a", 2), 3) # banAnas |
| assert_eq(bananas.index("a", 3), 3) # banAnas |
| assert_eq(bananas.index("b", 0), 0) # Bananas |
| assert_eq(bananas.index("n", -3), 4) # banaNas |
| assert_eq(bananas.index("s", -2), 6) # bananaS |
| |
| bananas.index("n", -2) ### not found in list |
| --- |
| bananas = ["b", "a", "n", "a", "n", "a", "s"] |
| bananas.index("b", 1) ### not found in list |
| --- |
| bananas = ["b", "a", "n", "a", "n", "a", "s"] |
| |
| # start, end |
| assert_eq(bananas.index("s", -1000, 7), 6) # bananaS |
| bananas.index("s", -1000, 6) ### not found in list |
| --- |
| bananas = ["b", "a", "n", "a", "n", "a", "s"] |
| bananas.index("d", -1000, 1000) ### not found in list |
| |
| |
| --- |
| '123'['a'::] ### got string for start index, want int |
| --- |
| '123'[:'b':] ### got string for stop index, want int |
| --- |
| (1, 2, 3)[1::0] ### slice step cannot be zero |
| --- |
| [1, 2, 3][::0] ### slice step cannot be zero |
| --- |
| [1, 2, 3][1::0] ### slice step cannot be zero |
| --- |
| [1, 2, 3][:3:0] ### slice step cannot be zero |
| --- |
| [1, 2, 3][1:3:0] ### slice step cannot be zero |
| --- |
| [[1], [2]]['a'] ### got string for sequence index, want int |
| --- |
| [0, 1, 2][3] ### index out of range (index is 3, but sequence has 3 elements) |
| --- |
| [0, 1, 2][-4] ### index out of range (index is -4, but sequence has 3 elements) |
| --- |
| [0][-2] ### index out of range (index is -2, but sequence has 1 elements) |
| --- |
| [0][1] ### index out of range (index is 1, but sequence has 1 elements) |
| --- |
| [][1] ### index out of range (index is 1, but sequence has 0 elements) |
