Python中的具名元组类用法

>>> from collections import namedtuple >>> Point = namedtuple('Point', ['x', 'y', 'z']) #创建具名元组类 >>> Point <class '__main__.Point'> >>> p = Point(3, 4, 5) #实例化对象 >>> p Point(x=3, y=4, z=5) >>> p.x #访问成员 3 >>> p._fields #查看字段列表 ('x', 'y', 'z') >>> p._replace(x=30, z=8) #替换成员值，返回新对象 Point(x=30, y=4, z=8) >>> p Point(x=3, y=4, z=5) >>> p.x = 7 #不允许这样直接赋值 AttributeError: can't set attribute

>>> hash(p) #可哈希 5050912105994302585

>>> x = dict() >>> x[p] = 3 #可以作为字典的键 >>> x {Point(x=3, y=4, z=5): 3}