示例#1
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def test_year_format_1800():
    assert year_format(date(1800, 1, 1)) == '1800'
示例#2
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def test_year_format_datetime():
    assert year_format(datetime(2015, 1, 1)) == '2015'
示例#3
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def test_year_format_999():
    assert year_format(date(999, 1, 1)) == '0999'