Fuzzyman wrote:
Hello all,
I may well be being dumb (it has happened before), but I'm struggling
to fix some code breakage with Python 2.6.
I have some code that looks for the '__lt__' method on a class:
if hasattr(clr, '__lt__'):
However - in Python 2.6 object has grown a default implementation of
'__lt__', so this test always returns True.
class X(object): pass
...
X.__lt__
<method-wrapper '__lt__' of type object at 0xa15cf0>
X.__lt__ == object.__lt__
False
So how do I tell if the X.__lt__ is inherited from object? I can look
in the '__dict__' of the class - but that doesn't tell me if X
inherits '__lt__' from a base class other than object. (Looking inside
the method wrapper repr with a regex is not an acceptable answer...)
They're of different types. I'm not sure how much you could use that,
or how reliable it is.
>>> class A( object ):
... pass
...
>>> class B( object ):
... def __lt__( self, other ):
... pass
...
>>> hasattr( A, '__lt__' )
True
>>> hasattr( B, '__lt__' )
True
>>> A.__lt__
<method-wrapper '__lt__' of type object at 0x00B81D48>
>>> B.__lt__
<unbound method B.__lt__>
>>>
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