[Python-Dev] Sets: elt in dict, lst.include - really begs for a PEP

[Barry A. Warsaw]

>>>>> "SM" == Skip Montanaro <skip@mojam.com> writes:

    SM> it seems to me that the whole "if/for something in dict" thing
    SM> needds to be hashed out in a PEP.
    
    SM> There are apparently lots of varying opinions about what's
    SM> reasonable.  This topic seems related to PEP 212 (Loop Counter
    SM> Iteration) and PEP 218 (Adding a Built-In Set Object Type),
    SM> but may well warrant its own.

As keeper of PEP0, I have to agree.  I personally would vastly prefer
a new iterator protocol than syntax such as "for key:value in dict".
I'd really like to see a PEP on an iterator protocol for Python, but
like Skip, I'm too busy at the moment to do it myself.  If nobody
takes it on before then, I might be willing to champion such a PEP for
the 2.2 time frame.  Until then, I'm decidedly -1 on "for/if in dict".

-Barry