For review: PEP 308 - If-then-else expression
Christian Tismer
tismer at tismer.com
Tue Feb 11 17:42:27 EST 2003
Andrew Dalke wrote:
> Christian Tismer
>
>>Andrew Koenig:
>>
>>>If I were trying to make code easy to understand for inexperienced
>>>programmers, I would write str.join(',', lines) instead of
>>>','.join(lines).
>>
>>Great idea, IMHO!
>
>
> I thought it was kinda neat as well, until I realized
>
> str.join(sep, ["A", "B"])
>
> requires that sep be a byte string.
>
>
>>>> str.join(u",", ["A", "B"])
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> TypeError: descriptor 'join' requires a 'str' object but received a
> 'unicode'
The thing is symmetric:
>>> unicode.join(u" ", ("a","b"))
u'a b'
> Doing
> sep.join(["A", "B"])
>
> is better because it doesn't enforce the extra type checking.
It is all, somehow,consequent.
But I guess, the behavior is by chance and not intended.
Unless the class method notation is an artifact,
I think something should be done about it.
Something like a super-string class, which is as
dynamic as the "".join implementation.
ALternatively, it would need to be considered to
revert here and make the class method calling unavailable.
ciao - chris
--
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