ntoronto at cs.byu.edu
Fri Apr 11 09:43:55 CEST 2008
Erick Tryzelaar wrote:
> On Thu, Apr 10, 2008 at 8:47 AM, Mathias Panzenböck
> <grosser.meister.morti at gmx.net> wrote:
>> It would also help with local functions!
>> def foo():
>> var x = 1
>> def bar(y):
>> x += y * 2
> They've added something to py3k to handle this:
> def foo():
> x = 1
> def bar(y):
> nonlocal x
> x += y * 2
Indeed. Funny enough, it was a similar plea for a variable declaration
keyword (mine, in fact) that was the final straw. Thus, after a bit of
bike shedding and collision checking on the keyword spelling, "nonlocal"
Since the foremost use case has been handled, I expect a "var" proposal
to go nowhere. The rationale, IIRC, is rather compression-oriented: in a
language where only functions define inner scopes, it's far more likely
that an assignment is meant to refer to the current scope than an outer
scope. A declaration keyword is provided for the unlikely case, leaving
the likely case declaration-free.
In general, the more compressed your code is, the harder it is to detect
encoding errors. In this case, Python's designers decided on compression
over easy error detection.
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