Archetype language

[spir]

On 03/20/2011 09:44 PM, bearophile wrote:
>> >          # Logically, the following should produce a copy:
>> >          [x in coll]                        # dont work
> Your logic is broken.

I don't think so ;-) This is something I discussed on Python's design mailing 
list ("ideas"). The only reason why this is not possible to implement in python 
is that 'in' is also the membership operator. So that [x in coll] evaluates to 
[true] or [false]. Just replace 'in' by another keyword in the expression of 
list comprehensions, and, I guess, you won't find it broken:
	# filter only:
	negs = [x across coll if x<1]
instead of
	# current syntax forces mapping with identity function
	# in addition to filter:
	negs = [x for x in coll if x<1]

What's really weird is that mapping without filter is indeed possible; one is 
not forced to write:
	squares = [x*x for x in coll if true]
lol!

Denis
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