gf gf wrote:
Is there a better, more FP style, more Pythonic way to
write this:
def compute_vectors(samples, dset):
vectors = {}
for d in dset:
vectors[d] = [sample.get_val(d) for sample in
samples]
return vectors
Namely, I'd like to get rid of the initilization
(vectors = {}) and also the loop
Generate the whole dictionary on the fly with a Python 2.4 generator
expression:
dict((d, [sample.get_val(d) for sample in samples]) for d in dset)
Whether this is "better" or not I think mainly hinges on which
one you ahve an easier time understanding later. Personally I would
prefer this version, but it's easy to get carried away trying to
functionalize things to the point that a procedural version is much
easier to understand.
Yet, I'd hate to put an assignment into Python's FP list
> comprehensions.
Indeed it's not possible to have an assignment in a list comprehension.
(Unless it's a side-effect due to a function called by the list
comprehension.)
Ideally, I'd like something like this:
vectors.dict_add({d:result}) for [sample.get_val(d)
for sample in samples for d in dset].
You can't use the name "vectors" without first initializing it
somehow!
--
Michael Hoffman
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