[Python-Dev] Py3k: magical dir()

[Eric Smith]

Christian Heimes wrote:
> Dmitry Vasiliev schrieb:
>> Hello!
>>
>> I think it's a strange behavior:
>>
>> Python 3.1a0 (py3k:67851, Dec 19 2008, 16:50:32)
>> [GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> hash(range(10))
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> TypeError: unhashable type: 'range'
>>>>> dir(range(10))
>> ['__class__', '__delattr__', '__doc__', '__eq__', '__format__',
>> '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__',
>> '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__',
>> '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__',
>> '__setattr__', '__sizeof__', '__str__', '__subclasshook__']
>>>>> hash(range(10))
>> -1211318616
>>>>> hash(range(1000))
>> -1211318472
> 
> Yes, it is. I'm able to reproduce the problem.

It's not just dir(). Same behavior with help():

Python 3.1a0 (py3k:67856, Dec 19 2008, 10:18:03)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> hash(range(10))
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'range'
[43173 refs]
 >>> help(range(10))

[77213 refs]
 >>> hash(range(10))
5041912
[77215 refs]
 >>>