示例#1
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def test_simple(simple_string):
    assert firstlast(simple_string) == 'ad'
示例#2
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def test_element_0(simple_string):
    assert firstlast(simple_string)[0] == 'a'
示例#3
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def test_first_last_list():
    assert firstlast([1, 2, 3, 4]) == [1, 4]
示例#4
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def test_first_last_string():
    assert firstlast("abcd") == "ad"
示例#5
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def test_first_last_tuple():
    assert firstlast((1, 2, 3, 4)) == (1, 4)