[Python-Dev] Using and binding relative names (was Re: PEP forBetter Control of Nested Lexical Scopes)

Tim Peters tim.peters at gmail.com
Wed Mar 1 08:13:58 CET 2006

[Alex Martelli]
>> We stole list comprehensions and genexps from Haskell

[Greg Ewing]
> The idea predates Haskell, I think. I first saw it in
> Miranda, and it may have come from something even
> earlier -- SETL, maybe?

Haskell indeed took list comprehensions from SETL.  SETL in turn
adopted them from pre-computer standard notation in set theory,
related to the oddly named (but not universally so named) "axiom of

genexps were more directly taken from Icon (because of the "generator" part).

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