在派生自 uuid.UUID 的自定义类中设置属性：AttributeError

如何解决在派生自 uuid.UUID 的自定义类中设置属性：AttributeError

我正在将一些代码从 IronPython 移植到 cpython (3.8) + Python.NET 并且我有一个以奇怪的方式损坏的自定义类：它给了我一个 AttributeError 即使该成员存在于 { {1}}。此类派生自 __dict__ 以添加对 BLE 短 UUID 的支持：

uuid.UUID

我是这样使用它的：

import uuid

class UUID(uuid.UUID):
    """Represents a more general version of the uuid.UUID,so we can have both
            regular and short UUIDs.
    """

    def __init__(self,hex=None,bytes=None,is_short=False,**kwargs):
        try:
            super(UUID,self).__init__(hex=hex,bytes=bytes,**kwargs)
            self.__dict__['is_short'] = False
        except ValueError as val_ex:
            if hex is None or len(hex) != 4:
                raise val_ex

            # Remove braces GUIDs 
            hex_digits = hex.strip('{}').replace('-','')

            # remove RFC 4122 URN's 'urn:uuid:deadbeef-1234-fedc-5678-deadbeefaaaa'
            hex_digits = hex_digits.replace('uuid:','').replace('urn:','')

            if len(hex_digits) != 4:
                raise ValueError('badly formed hexadecimal UUID string')
            self.__dict__['int'] = int(hex,16)
            self.__dict__['is_short'] = True

        if is_short is True:
            self.__dict__['is_short'] = True

    def __str__(self):
        if self.is_short:
            hex = '%04x' % self.int
            return '%s' % (hex[:4])
        else:
            return super(UUID,self).__str__()

以上代码产生：

class Test_UUID(unittest.TestCase):
    def test_create(self):
        x = pybletestlibrary.UUID("1800")
        pprint(x.__dict__)
        print(x)

我不能使用 {'int': 6144,'is_short': True} E ====================================================================== ERROR: test_create (__main__.Test_UUID) ---------------------------------------------------------------------- Traceback (most recent call last): File "test\test_pybletestlibrary.py",line 27,in test_create print(x) File "my_uuid.py",line 66,in __str__ hex = '%04x' % self.int AttributeError: int ---------------------------------------------------------------------- Ran 1 test in 0.003s Failed (errors=1) ，因为 setattr() 是不可变的。我不明白为什么 uuid.UUID 作为 AttributeError 出现在 int 中。有什么建议吗？

谢谢！！

解决方法

我的意思是：

import uuid

class UUID(uuid.UUID):
    """Represents a more general version of the uuid.UUID,so we can have both
            regular and short UUIDs.
    """

    def __init__(self,hex=None,bytes=None,is_short=False,**kwargs):
        self.is_short = False
        if len(hex) == 4:
            self.is_short = True
            hex = "0000"+hex+"-0000-1000-8000-00805f9b34fb"
        super(UUID,self).__init__(hex=hex,bytes=bytes,**kwargs)

    def __str__(self):
        val = super(UUID,self).__str__()
        if self.is_short:
            return val[4:8]
        else:
            return val

您可能还需要覆盖其他一些属性。