Python cast_checkの例

コード例 #1

ファイル: test_ast.py プロジェクト: Lenqth/sympy

def test_Type__cast_check__floating_point():
    raises(ValueError, lambda: f32.cast_check(123.45678949))
    raises(ValueError, lambda: f32.cast_check(12.345678949))
    raises(ValueError, lambda: f32.cast_check(1.2345678949))
    raises(ValueError, lambda: f32.cast_check(.12345678949))
    assert abs(123.456789049 - f32.cast_check(123.456789049) - 4.9e-8) < 1e-8
    assert abs(0.12345678904 - f32.cast_check(0.12345678904) - 4e-11) < 1e-11

    dcm21 = Float('0.123456789012345670499')  # 21 decimals
    assert abs(dcm21 - f64.cast_check(dcm21) - 4.99e-19) < 1e-19

    f80.cast_check(Float('0.12345678901234567890103', precision=88))
    raises(ValueError, lambda: f80.cast_check(Float('0.12345678901234567890149', precision=88)))

    v10 = 12345.67894
    raises(ValueError, lambda: f32.cast_check(v10))
    assert abs(Float(str(v10), precision=64+8) - f64.cast_check(v10)) < v10*1e-16

    assert abs(f32.cast_check(2147483647) - 2147483650) < 1

コード例 #2

def test_Type__cast_check__floating_point():
    raises(ValueError, lambda: f32.cast_check(123.45678949))
    raises(ValueError, lambda: f32.cast_check(12.345678949))
    raises(ValueError, lambda: f32.cast_check(1.2345678949))
    raises(ValueError, lambda: f32.cast_check(.12345678949))
    assert abs(123.456789049 - f32.cast_check(123.456789049) - 4.9e-8) < 1e-8
    assert abs(0.12345678904 - f32.cast_check(0.12345678904) - 4e-11) < 1e-11

    dcm21 = Float('0.123456789012345670499')  # 21 decimals
    assert abs(dcm21 - f64.cast_check(dcm21) - 4.99e-19) < 1e-19

    f80.cast_check(Float('0.12345678901234567890103', precision=88))
    raises(ValueError, lambda: f80.cast_check(Float('0.12345678901234567890149', precision=88)))

    v10 = 12345.67894
    raises(ValueError, lambda: f32.cast_check(v10))
    assert abs(Float(str(v10), precision=64+8) - f64.cast_check(v10)) < v10*1e-16

    assert abs(f32.cast_check(2147483647) - 2147483650) < 1