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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Finding the Min for positive and negative in python 3.3 list
Date: Tue, 12 Mar 2013 13:57:08 -0400
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Xref: csiph.com comp.lang.python:41144

On 3/12/2013 1:03 PM, Norah Jones wrote:
> For example:
> a=[-15,-30,-10,1,3,5]
>
> I want to find a negative and a positive minimum.
>
> example: negative
> print(min(a)) = -30
>
> positive
> print(min(a)) = 1

If this is homework, stop reading and do it yourself ;-)
Otherwise...
 >>> min(i for i in a if i >0)
1
 >>> max(i for i in a if i < 0)
-10
 >>> min(i for i in a if i < 0)
-30

You did not specify if you would include 0 in a pos min (0 is neither 
really positive or negative).

-- 
Terry Jan Reedy