[Python-Dev] PEP 457: Syntax For Positional-Only Parameters (original) (raw)
Greg Ewing greg.ewing at canterbury.ac.nz
Thu Oct 10 04:33:16 CEST 2013
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On 10/10/13 09:51, Larry Hastings wrote:
Perhaps we could add (egad, no, I can't believe I'm saying this) a new built-in function that tells you whether or not a local variable has been assigned to yet?
def range([start,] stop, [step], /): if not bound(start): start = 0 if not bound(step): step = 1 ...
It couldn't be a function in the usual sense, because attempting to evaluate the unbound parameter would raise an exception before the function was called.
It would have to be something magical, probably a new piece of syntax understood by the compiler.
-- Greg
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