comp.lang.python Google Group

Re: Capturing output of os.system to a string

gabut...@acslink.net.au (gerry.butler) — Tue, 24 Nov 2009 02:11:08 UT

Thank you. I'll look at subprocess.
I have since found that commands will do it too, eg,
(status, txt) = commands.getstatusoutput('whoa mi')
or txt = commands.getoutput('whoami')

Re: Any elegant way to construct the complete $k$-partite graph in Python?

debat...@gmail.com (geremy condra) — Tue, 24 Nov 2009 02:10:37 UT

Sorry, misread- to generate a k-partite graph, you'll need a bit
more legwork. Give me a bit and I'll add it to graphine.
Geremy Condra

Re: profiling differences using an extra function call

lie.1...@gmail.com (Lie Ryan) — Tue, 24 Nov 2009 02:08:24 UT

That's because there is a function call overhead.
A very simple function body will (in terms of percentage) have larger
function overhead. With a slightly more complex function body, the body
will takes much more time than the function call overhead.
Look in the absolute numbers: 0.666 CPU seconds vs. 0.248 CPU seconds

Re: Waiting for receiving data

geraldwalk...@gmail.com (Gerald Walker) — Tue, 24 Nov 2009 02:06:05 UT

Typo, edited for clarity:
That is: "..the thread can go *away* by itself after the default timeout
expires." You don't need to explicitly kill it.

Re: Any elegant way to construct the complete $k$-partite graph in Python?

debat...@gmail.com (geremy condra) — Tue, 24 Nov 2009 02:03:38 UT

On Mon, Nov 23, 2009 at 7:05 PM, Paul Miller
Graphine does this with the following:
from base import Graph
def K(n):
"""Generates a completely connected undirected graph of size n.
The verticies are numbered [0, n).
The edges are named after the verticies they connect such that
an edge connected verticies 1 and 2 is named (1,2).

Re: Waiting for receiving data

geraldwalk...@gmail.com (Gerald Walker) — Tue, 24 Nov 2009 02:01:55 UT

Also, if you are using multiple threads to retrieve the xml source(s)
and any thread blocks due to network problems, the thread can go way by
itself after the default timeout expires.

Re: More precise document on os.path.normpath()

benjamin.kap...@case.edu (Benjamin Kaplan) — Tue, 24 Nov 2009 01:59:39 UT

Just file a bug report listing what part you find unclear and what you
suggest they put to clarify it.

Re: Waiting for receiving data

geraldwalk...@gmail.com (Gerald Walker) — Tue, 24 Nov 2009 01:53:23 UT

import socket
from urllib2 import urlopen
socket.setdefaulttimeout(0.01)
xml_source = "[link]"
try:
data = urlopen(xml_source)
except urllib2.URLError, e:
print 'URLError = ' + str(e.reason)

Re: Relative versus absolute paths on Windows

et...@stoneleaf.us (Ethan Furman) — Tue, 24 Nov 2009 01:44:46 UT

Given that it's documented to work that way, I'll agree that this is not
a bug -- however, that doesn't mean it's /right/.
From the documentation:
Join one or more path components *intelligently*.
To me, that means taking into account the bizarre in the MS world of
multiple roots on a system... I know I have looked at os.path.join a

Re: UnicodeDecodeError? Argh! Nothing works! I'm tired and hurting and...

tjre...@udel.edu (Terry Reedy) — Tue, 24 Nov 2009 01:48:40 UT

I believe this is the same as
write = sys.stdout.write
though you never use it that I see.
I presume you are expecting the line to be undecoded bytes, as with
open(f,'rb'). To be sure, add write(type(line)).
I do not understand why you are writing since you just wanted to look.
In any case, you open in text mode.

Re: Capturing output of os.system to a string

lie.1...@gmail.com (Lie Ryan) — Tue, 24 Nov 2009 01:40:00 UT

You can't with os.system; use subprocess module instead.

Capturing output of os.system to a string

gabut...@acslink.net.au (gerry.butler) — Tue, 24 Nov 2009 01:27:50 UT

How do I capture output to a string? For example, the output of
os.system('whoami').
I guess I need to redirect stdout, but I'm a total beginner, and I
haven't been able to find out from the tutorials how to do this.

Re: Relative versus absolute paths on Windows

li...@cheimes.de (Christian Heimes) — Tue, 24 Nov 2009 01:23:19 UT

No, it's not a bug. Since \bar is an absolute path, all path segments
before the absolute path are ignored. This is documented at
[link]
True
'\\bar'
Posixpath follows the same rules, too.
'/var'
'../egg/var'
Christian

Re: Line-continuation "Anti-Idiom" and with statement

tjre...@udel.edu (Terry Reedy) — Tue, 24 Nov 2009 01:09:18 UT

MRAB wrote:
Then a line ending with ', ' would be different from one ending with
',', useless space and tabs at ends of lines were *always* ignored. Not
sure whether that would create problems though.