On Thu, 14 Oct 2010 08:48:45 -0700, Roger Davis wrote:
On a related point here, I have one case where I need to replace the
shell construct
externalprog somefile otherfile
I suppose I could just use os.system() here but I'd rather keep the
Unix shell completely out of the picture
In message i968f501...@news6.newsguy.com, Chris Torek wrote:
Running the above code fragment in a different implementation, in
which garbage collection is deferred, would *not* close the file
descriptor, and the system would potentially run out (depending on
when a gc occurred, and/or whether
In message
8bec27dd-b1da-4aa3-81e8-9665db040...@n40g2000vbb.googlegroups.com, Roger
Davis wrote:
Documentation on python.org states that GC can be postponed or omitted
altogether ...
Yes, but no sensible Python implementation would do that, as it’s a recipe
for resource bloat.
--
In message pan.2010.10.15.06.27.02.360...@nowhere.com, Nobody wrote:
Another gotcha regarding pipes: the reader only sees EOF once there are no
writers, i.e. when the *last* writer closes their end.
Been there, been bitten by that.
--
http://mail.python.org/mailman/listinfo/python-list
In message pan.2010.10.15.06.27.02.360...@nowhere.com, Nobody wrote:
Another gotcha regarding pipes: the reader only sees EOF once there are no
writers, i.e. when the *last* writer closes their end.
In article i9atra$j4...@lust.ihug.co.nz
Lawrence D'Oliveiro l...@geek-central.gen.new_zealand
In article b166181a-2aba-4c3a-948d-674755459...@c10g2000yqh.googlegroups.com
Roger Davis r...@hawaii.edu wrote:
My understanding is that this functionality is best coded via
subprocess.Popen().
Best is always a big question mark. :-)
I need to read output from these spawned children
via a pipe
Many thanks to all who responded to my question! It's nice to know, as
someone new to Python, that there are lots of well-informed people out
there willing to help with such issues.
Thanks, Mike, for your pipes suggestion, I will keep that in mind for
future projects.
Seebs, you are of course
In article 8bec27dd-b1da-4aa3-81e8-9665db040...@n40g2000vbb.googlegroups.com
'Nobody' (clearly a misnomer!) and Chris, thanks for your excellent
explanations about garbage collection. (Chris, I believe you must have
spent more time looking at the subprocess source and writing your
response than I
On 2010-10-14, Roger Davis r...@hawaii.edu wrote:
Seebs, you are of course correct that the example I quoted (`cat |
grep | whatever`) is best done internally with the re module and built-
in language features, and in fact that has already been done wherever
possible. I should have picked a
Hi, I am new to this group, please forgive me if this is a repeat
question. I am a new Python programmer but experienced in C/Unix. I am
converting a shell script to Python which essentially loops
infinitely, each pass through the loop running commands like
set output = `cat this | grep
You might want to check out the Python 2.7 'pipes' standard library
module: http://docs.python.org/library/pipes.html
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http://mail.python.org/mailman/listinfo/python-list
On 2010-10-13, Roger Davis r...@hawaii.edu wrote:
Hi, I am new to this group, please forgive me if this is a repeat
question. I am a new Python programmer but experienced in C/Unix. I am
converting a shell script to Python which essentially loops
infinitely, each pass through the loop running
On Wed, 13 Oct 2010 14:58:57 -0700, Roger Davis wrote:
My understanding is that this functionality is best coded via
subprocess.Popen(). I need to read output from these spawned children
via a pipe from their stdout, hence something like
p= subprocess.Popen(args,
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