>> Currently I'm just putting this at the top of the file:
>> py=1
>> funcpre=2
>> funcpost=3
>> ...
>
> That can be done more compactly with
>
> py, funcpre, funcpost = range(3)
I've harbored a hope that a combination of PEP 3132[1] ("Extended
Iterable unpacking") and itertools.count()[2] would be available
for doing something like this:
py, funcpre, funcpost, *unexhausted_iterator = count()
which would theoretically allow me to just add new enum names to
the LHS without having to update constant passed to range() on
the RHS.
Unfortunately, it looks like this wasn't a desirable behavior
because the PEP describes the "*unexhausted_iterator" notation
unpacking as a list, not as an iterable.
My desired syntax would work well for bit-mask fields as well:
def bit_iter(i=0):
assert i >= 0
while True:
yield 1 << i
i += 1
read, write, execute, *_ = bit_iter()
and I'm sure there are other use-cases I've not yet considered.
Diez Roggisch hacked together a disturbingly (in the "that hurts
my brain to sniff the stack" way) beautiful/functional
decorator[3] that does something like this in Python2.4+ and can
just be used something like
@variably_unpack
def just_enough(): return itertools.count()
read, write, execute = just_enough()
which is a fabulous syntax, IMHO.
-tkc
[1]
http://www.python.org/dev/peps/pep-3132/
[2]
http://docs.python.org/dev/library/itertools.html#itertools.count
[3]
http://groups.google.com/group/comp.lang.python/browse_thread/thread/63dce474e196adac/d98522d9bedae946#d98522d9bedae946
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