Re: [Python-ideas] namedtuple() subclasses again

27 Mar 2011


      On Fri, 25 Mar 2011 15:06:37 +0100
Jan Kaliszewski  wrote:
...
...and especially:
class MyAbstractNamedTuple(namedtuple.abc):
        def __repr__(self):
            "My sophisticated __repr__()"
        # and e.g. some new methods...
class MyNamedTupleA(MyAbstractNamedTuple):
        _fields = 'a b c'
class MyNamedTupleB(MyAbstractNamedTuple):
        _fields = (
            'one_field',
            'another_field',
            'and_another_one',
        )
Can't you multiple inheritance instead?
...
...
...
class Base(tuple):
...   def _method(self): return 5
...   __slots__ = ()
... 
class C(Base, namedtuple('Point', 'x y')):
...   __slots__ = ()
... 
c = C(x=1, y=2)
c
C(x=1, y=2)
c._method()
5
c.__dict__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'C' object has no attribute '__dict__'
a, b = c
a
1
b
2
Antoine.

Re: [Python-ideas] namedtuple() subclasses again

Antoine Pitrou