Luca Cerone wrote:
Thanks! I managed to make it work using the threading library :)
If at least one of the external programs can accept the source
or destination as a filename argument instead of redirecting its
stdin or stdout, you can also do something like this:
import subprocess
p2 = subp
> my_thread.join()
Thanks! I managed to make it work using the threading library :)
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On 05/08/2013 22:47, Luca Cerone wrote:
You're back to using separate threads for the reader and the writer.
And how do I create separate threads in Python? I was trying to use the
threading library without not too success..
To run a function in a separate thread:
import threading
def my_f
> You're back to using separate threads for the reader and the writer.
>
And how do I create separate threads in Python? I was trying to use the
threading library without not too success..
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On 05/08/2013 17:54, Luca Cerone wrote:
Thanks this works (if you add shell=True in Popen).
If I don't want to use shell = True, how can I redirect the stdout to
named_pipe? Popen accepts an open file handle for stdout, which I can't open
for writing because that blocks the process...
You're
Thanks this works (if you add shell=True in Popen).
If I don't want to use shell = True, how can I redirect the stdout to
named_pipe? Popen accepts an open file handle for stdout, which I can't open
for writing because that blocks the process...
>
>
> os.mkfifo("named_pipe", 0777)
>
> ls_proc
On 2013-08-05, Luca Cerone wrote:
> I just would like to learn how to handle named pipes in Python,
> which I find it easier to do by using a simple example that I
> am comfortable to use :)
Names pipes are a unix concept that saves you the hassle and
limitations of writing to and reading from a
On 05/08/2013 16:27, Luca Cerone wrote:
Thanks MRAB,
You need to ensure that the pipe is already open at the other end.
So I need to open the process that reads the pipe before writing in
it?
Why are you using a named pipe anyway?
For some bug in ipython (see my previous email) I can't u
Thanks MRAB,
>
> You need to ensure that the pipe is already open at the other end.
So I need to open the process that reads the pipe before writing in it?
>
>
>
> Why are you using a named pipe anyway?
For some bug in ipython (see my previous email) I can't use subprocess.Popen
and pipe in
Hi Alister,
> Are you sure you are using the correct tool for the task?
Yes. For two reasons: 1. I want to learn how to do this in Python :) 2. for an
application I have in mind I will need to run external tools (not developed by
me) and process the output using some tools that I have written in
On 05/08/2013 15:11, Luca Cerone wrote:
Hi MRAB, thanks for the reply!
Opening the pipe for reading will block until it's also opened for
writing, and vice versa.
OK.
In your bash code, 'ls' blocked until you ran 'cat', but because you
ran 'ls' in the background you didn't notice it!
R
On Mon, 05 Aug 2013 06:09:53 -0700, Luca Cerone wrote:
> Hi everybody,
> I am trying to understand how to use named pipes in python to launch
> external processes (in a Linux environment).
>
> As an example I am trying to "imitate" the behaviour of the following
> sets of commands is bash:
>
>>
Hi MRAB, thanks for the reply!
>
> Opening the pipe for reading will block until it's also opened for
>
> writing, and vice versa.
>
OK.
>
>
> In your bash code, 'ls' blocked until you ran 'cat', but because you
>
> ran 'ls' in the background you didn't notice it!
>
>
Right.
>
> In your
On 05/08/2013 14:09, Luca Cerone wrote:
Hi everybody,
I am trying to understand how to use named pipes in python to launch external
processes (in a Linux environment).
As an example I am trying to "imitate" the behaviour of the following sets of
commands is bash:
mkfifo named_pipe
ls -lah >
Hi Paul, first of all thanks for the help.
I am aware of the first solutions, just now I would like to experiment a bit
with using named pipes (I also know that the example is trivial, but it just
to grasp the main concepts)
>
> You can also pass a file object to p1's stdout and p2's stdin if
On 5 August 2013 14:09, Luca Cerone wrote:
> Hi everybody,
> I am trying to understand how to use named pipes in python to launch
> external processes (in a Linux environment).
>
> As an example I am trying to "imitate" the behaviour of the following sets
> of commands is bash:
>
> > mkfifo named
Hi everybody,
I am trying to understand how to use named pipes in python to launch external
processes (in a Linux environment).
As an example I am trying to "imitate" the behaviour of the following sets of
commands is bash:
> mkfifo named_pipe
> ls -lah > named_pipe &
> cat < named_pipe
In Pyt
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