[Python-Dev] Suirprise!

[Barry A. Warsaw]

>>>>> "TP" == Tim Peters <tim.one@home.com> writes:

    TP> It's "correct".  I've been using Python longer than Guido
    TP> <wink>, and I'm amazed this is the first time I got bit by
    TP> this!  Here's a hint:

Oh, that is twisted! :)

Let's throw in some parentheses just to confuse people even more:

>>> 'a' in 'a' == 'a'
1
>>> ('a' in 'a') == 'a'
0
>>> 'a' in ('a' == 'a')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: 'in' or 'not in' needs sequence right argument
>>> 'a' in 'a' == 1
0
>>> ('a' in 'a') == 1
1
>>> 'a' in ('a' == 1)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: 'in' or 'not in' needs sequence right argument

>>>>> "PP" == Paul Prescod <paulp@ActiveState.com> writes:

    PP> It looks like dubious hypergeneralization to me! <0.7 wink>
    PP> Seriously, does this "feature" ever make sense to apply to the
    PP> in operator?

I don't know; I wonder if "normal" people think of `in' as a chainable
comparison operator or not.  You're not suggesting to change this are
you?

gotta-leave-something-`in'-there-for-job-security-ly y'rs,
-Barry