Re: Comprehensions

Mark Hahn wrote:

> Paul Prescod wrote:
> 
> 
>>Is there a deep reason that Prothon doesn't have 
>>comprehensions or is it 
>>just not implemented yet? I think that Python programmers 
>>would scream 
>>if they were left out.
> 
> 
> Are you talking about list comprehensions?  Prothon has list
> comprehensions.

paul:/tmp pprescod$ /usr/local/bin/prothon -v
Prothon 0.1, Build 710, Jul  6 2004
paul:/tmp pprescod$ cat ./test.pr
#!/usr/local/bin/prothon

a = [1,2,3]
print [ x*2 for x in a]

paul:/tmp pprescod$ ./test.pr

Parse Error: expecting `']''
--- File: ./test.pr, line: 4, col: 16
print [ x*2 for x in a]
                ^

Uncaught exception:
Parse Error.

paul:/tmp pprescod$ python ./test.pr
[2, 4, 6]

Anyhow, generator comprehensions are more modern than list 
comprehensions and you can easily turn a generator comprehension into a 
list comprehension explicitly:

list(x*2 for x in a)

http://www.python.org/dev/doc/devel/whatsnew/node4.html

  Paul Prescod