[IPython-dev] Re: [IPython-user] Feedback request on a new feature
fperez at colorado.edu
Mon Dec 22 12:51:19 CST 2003
Prabhu Ramachandran wrote:
>>>>>>"FP" == Fernando Perez <fperez at colorado.edu> writes:
> FP> Hi all, I'd like to solicit a bit of feedback from the
> FP> community on a new feature. I often get asked about a quick
> FP> way to capture shell output to a python variable for further
> FP> manipulation. Granted, you can always do
> FP> In : $b=ls C*.py
> Yes, yes! This would be useful.
> FP> - It's not bloat, but a different syntax would be better, like
> FP> !!b=ls *py
> That sounds good. There's already '!ls' so !! is a natural extension.
> How about `ls`, i.e. back quotes?
I can't reuse back quotes, because they are already a python synonym for
repr(). But !! might be a good thing: it has the advantage that if you do
!something, and later want its output, you just need to up-arrow and add
another ! character. The implementation is a tad more involved than with a
separate character ($), but it may be worth the added hassle once to keep the
number of special syntaxes to a minimum.
> FP> - Don't even print the output, it should just behave like
> FP> getoutput(). People
> FP> can print out the variable if they need it (esp. useful if the
> FP> output is potentially huge, but you want it trapped for
> FP> processing).
> Yes, that sounds good. For example if you want to read a file you
> would just do:
> a = `cat foo`
> or whatever (I am not sure if the above will be implementable or not).
> If you want to print it you can always do
> !cat foo
> So, I don't see why you'd want to print out the command.
> FP> - You should split the output and return a list, since that's
> FP> what people will
> FP> want most of the time.
> No, please, that sounds unPythonic to me.
Thanks for the feedback. I'll give it a few days to hear back from people and
will post a final draft of how to implement it.
ps: Prabhu, I think you are mailing from a different address than you
originally subscribed from, because your mails to the list were bounced. If
you want, I can subscribe you from your new address. Sorry, but the volume of
spam was out of control, so I started blocking non-subscriber posts, and this
may catch legitimate subscribers who use different addresses.
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