如何在python内部实现命名元组？

实际上，很容易找出给定

namedtuple

verbose=True

>>> Point = namedtuple('Point', "x y", verbose=True)from builtins import property as _property, tuple as _tuplefrom operator import itemgetter as _itemgetterfrom collections import OrderedDictclass Point(tuple):    'Point(x, y)'    __slots__ = ()    _fields = ('x', 'y')    def __new__(_cls, x, y):        'Create new instance of Point(x, y)'        return _tuple.__new__(_cls, (x, y))    @classmethod    def _make(cls, iterable, new=tuple.__new__, len=len):        'Make a new Point object from a sequence or iterable'        result = new(cls, iterable)        if len(result) != 2: raise TypeError('Expected 2 arguments, got %d' % len(result))        return result    def _replace(_self, **kwds):        'Return a new Point object replacing specified fields with new values'        result = _self._make(map(kwds.pop, ('x', 'y'), _self))        if kwds: raise ValueError('Got unexpected field names: %r' % list(kwds))        return result    def __repr__(self):        'Return a nicely formatted representation string'        return self.__class__.__name__ + '(x=%r, y=%r)' % self    @property    def __dict__(self):        'A new OrderedDict mapping field names to their values'        return OrderedDict(zip(self._fields, self))    def _asdict(self):        '''Return a new OrderedDict which maps field names to their values.This method is obsolete.  Use vars(nt) or nt.__dict__ instead.        '''        return self.__dict__    def __getnewargs__(self):        'Return self as a plain tuple.  Used by copy and pickle.'        return tuple(self)    def __getstate__(self):        'Exclude the OrderedDict from pickling'        return None    x = _property(_itemgetter(0), doc='Alias for field number 0')    y = _property(_itemgetter(1), doc='Alias for field number 1')

因此，它是的子类，

tuple

_fields

property

至于实际建立该类定义的代码，那真是
不可思议

。