[Python-Dev] PEP 218 (sets); moving set.py to Lib

Paul Svensson paul-python@svensson.org
Tue, 20 Aug 2002 19:27:53 -0400 (EDT)

On Tue, 20 Aug 2002, Guido van Rossum wrote:

>> From: "Guido van Rossum" <guido@python.org>
>> > I am still perplexed that I receoved *no* feedback on the sets module
>> > except on this issue of sort order (which I consider solved by adding
>> > a method _repr() that takes an optional 'sorted' argument).
>> I think the __init__() code in BaseSet should be pushed down into Set and ImmutableSet.  It should be replaced by code raising a
>> TypeError just like we do for basestring:
>> >>> basestring('abc')
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in ?
>> TypeError: The basestring type cannot be instantiated
>Good idea.  I checked this in, raising NotImplementedError.

Is there any particular reason BaseSet and basestring need to raise different
exceptions on an attempt at instantiation ?