On Sat, Jun 11, 2011 at 9:30 AM, Jan Kaliszewski <zuo@chopin.edu.pl> wrote:
== Proposed solutions ==
I see three possibilities:
1. To add a new keyword, e.g. `inject': def do_and_remember(val, verbose=False): inject mem = collections.Counter() ... or maybe: def do_and_remember(val, verbose=False): inject collections.Counter() as mem ...
2. (which personally I would prefer) To add `dummy' (or `hidden') keyword arguments, defined after **kwargs (and after bare ** if kwargs are not needed; we have already have keyword-only arguments after *args or bare *):
def do_and_remember(val, verbose=False, **, mem=collections.Counter()): ...
do_and_remember(val, False, mem='something') would raise TypeError and `mem' shoudn not appear in help() etc. as a function argument.
3. To provide a special decorator, e.g. functools.within: @functools.within(mem=collections.Counter()) def do_and_remember(val, verbose=False): ...
For these cases I use a class based solution. It's simple and easy to test. class DoAndRemember: def __init__(self): self._mem = collections.Counter() def __call__(self, val, verbose=False): result = do_something(val) self.mem[val] += 1 if verbose: print('Done {} times for {!r}'.format(mem[val], val)) do_and_remember = DoAndRemember() -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek www: http://dstanek.com