我正在尝试构建一个类，它继承了Python列表中的方法，但也在上面做了一些额外的事情......在这一点上显示代码可能更容易......

class Host(object):
    """Emulate a virtual host attached to a physical interface"""
    def __init__(self):
    # Insert class properties here...
    pass

class HostList(list):
    """A container for managing lists of hosts"""
    def __init__(self):
        self = []

    def append(self, hostobj): 
        """append to the list...""" 
        if hostobj.__class__.__name__ == 'Host': 
            self.insert(len(self), hostobj)
        else:
            _classname = hostobj.__class__.__name__
            raise RuntimeError, "Cannot append a '%s' object to a HostList" % _classname

我的问题是...如果我想在insert()上执行与在append()上执行的相同类型的对象接纳测试，我无法找到一种方法来编写新方法，而不牺牲对一个列表扩展方法的支持（即list.append()、list.insert()或list.extend()）。如果我试图支持所有这些，我最终会得到递归循环。解决这个问题的最佳方法是什么？

编辑：我接受了关于子类化collections.MutableSequence而不是Python的list（）的建议

结果代码...张贴在这里的情况下，它帮助别人...

from collections.abc import MutableSequence
class HostList(MutableSequence):
    """A container for manipulating lists of hosts"""
    def __init__(self, data):
        super(HostList, self).__init__()
        if (data is not None):
            self._list = list(data)
        else:
            self._list = list()

    def __repr__(self):
        return "<{0} {1}>".format(self.__class__.__name__, self._list)

    def __len__(self):
        """List length"""
        return len(self._list)

    def __getitem__(self, ii):
        # Good MutableSequence() implementation example in the cpython git repo:
        #    https://github.com/python/cpython/blob/208a7e957b812ad3b3733791845447677a704f3e/Lib/collections/__init__.py#L1215
        if isinstance(ii, slice):                                               
            return self.__class__(self._list[ii])                                
        else:                                                                   
            return self._list[ii] 

    def __delitem__(self, ii):
        """Delete an item"""
        # optional: self._acl_check(val)
        del self._list[ii]

    def __setitem__(self, ii, val):
        # optional: self._acl_check(val)
        self._list[ii] = val
    def __str__(self):
        return str(self._list)
    def insert(self, ii, val):
        # optional: self._acl_check(val)
        self._list.insert(ii, val)
    def append(self, val):
        # optional: self._acl_check(val)
        self._list.append(val)