How to use the nptyping.types._unicode.Unicode function in nptyping

def test_get_type_str(self):
        self.assertEqual(Unicode[4], get_type('Test'))

self.assertEqual(Int8, get_type(np.int8(42)))
        self.assertEqual(Int16, get_type(np.int16(42)))
        self.assertEqual(Int32, get_type(np.int32(42)))
        self.assertEqual(Int64, get_type(np.int64(42)))

        self.assertEqual(UInt8, get_type(np.uint8(42)))
        self.assertEqual(UInt16, get_type(np.uint16(42)))
        self.assertEqual(UInt32, get_type(np.uint32(42)))
        self.assertEqual(UInt64, get_type(np.uint64(42)))

        self.assertEqual(Float16, get_type(np.float16(42.0)))
        self.assertEqual(Float32, get_type(np.float32(42.0)))
        self.assertEqual(Float64, get_type(np.float64(42.0)))

        self.assertEqual(Unicode, get_type(np.unicode))
        self.assertEqual(Unicode[40], get_type(np.dtype(('U', 40))))

        self.assertEqual(Bool, get_type(np.bool_(True)))
        self.assertEqual(Bool, get_type(np.bool_(False)))

def get_type_str(obj: Any) -> Type[Unicode]:
    """
    Return the NPType that corresponds to obj.
    :param obj: a string compatible object.
    :return: a Unicode type.
    """
    if isinstance(obj, numpy.dtype):
        return Unicode[obj.itemsize / 4]
    if obj == str:
        return Unicode
    if not isinstance(obj, str):
        raise TypeError('Unsupported type {}'.format(type(obj)))
    return Unicode[len(obj)]

def get_type_str(obj: Any) -> Type[Unicode]:
    """
    Return the NPType that corresponds to obj.
    :param obj: a string compatible object.
    :return: a Unicode type.
    """
    if isinstance(obj, numpy.dtype):
        return Unicode[obj.itemsize / 4]
    if obj == str:
        return Unicode
    if not isinstance(obj, str):
        raise TypeError('Unsupported type {}'.format(type(obj)))
    return Unicode[len(obj)]

def __subclasscheck__(cls, subclass: type) -> bool:
        if Unicode in get_mro(subclass):
            return cls.chars is Any or subclass.chars <= cls.chars
        return False