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Good. Thanks.<br>
<br>
Here's my code.<br>
==========<br>
# Executing a Linux program under Win XP<br>
from subprocess import call<br>
myProg = call(["C:\Sandia_Meteors\Various\FuzzyLogic\wolf", "-h"])<br>
==========<br>
But msgs are produced ...<br>
Traceback (most recent call last):<br>
File
"C:/Sandia_Meteors/Sentinel_Development/Development_Sentuser-Utilities/sentuser/fun-subprocess_Linux.py",
line 4, in <module><br>
myProg = call(["C:\Sandia_Meteors\Various\FuzzyLogic\wolf", "-h"])<br>
File "C:\Python25\lib\subprocess.py", line 444, in call<br>
return Popen(*popenargs, **kwargs).wait()<br>
File "C:\Python25\lib\subprocess.py", line 594, in __init__<br>
errread, errwrite)<br>
File "C:\Python25\lib\subprocess.py", line 816, in _execute_child<br>
startupinfo)<br>
<b>WindowsError: [Error 5] Access is denied</b><br>
<br>
I looked for the attributes on the file and it shows "A". I'm the admin
on my XP Pro, and the file is owned by Admin.<br>
wolf is a 1 meg file. <br>
<br>
Alan Gauld wrote:
<blockquote cite="mid:gpvk08$8st$1@ger.gmane.org" type="cite"><br>
"Wayne Watson" <a class="moz-txt-link-rfc2396E" href="mailto:sierra_mtnview@sbcglobal.net"><sierra_mtnview@sbcglobal.net></a> wrote
<br>
<br>
<blockquote type="cite">What is meant by "The arguments are the same
as for the Popen constructor.",
<br>
in Convenience Functions? In fact, what is such a function?
<br>
</blockquote>
<br>
It means that there is a function which takes the same arguments
<br>
as the __init__() method of the Popen class.
<br>
<br>
They are convenience functions in that you don't need to create the
class
<br>
to use them you can just call them directly. THe payoff is that you
lose
<br>
some of the flexibility of using the class, but often you don;t need
that.
<br>
<br>
<blockquote type="cite">class subprocess.Popen(args, bufsize=0,
executable=None, stdin=None, stdout=None, stderr=None, preexec_fn=None,
close_fds=False ....
<br>
Why not just class Popen instead of subprocess.Popen?
<br>
</blockquote>
<br>
The notation is saying that there is a class defined in the
<br>
subprocess module called Popen with a constructor that
<br>
has the listed parameters. It is just a shorthand way of
<br>
expressing that.
<br>
<br>
In practice you would create an instance with either:
<br>
<br>
import subprocess
<br>
p = subprocess.Popen(....)
<br>
<br>
OR
<br>
<br>
from subprocess import Popen
<br>
p = Popen(....)
<br>
<br>
<blockquote type="cite">Is there a suggestion here that I need only
do:
<br>
</blockquote>
from subprocess import Popen
<br>
<blockquote type="cite">myProg=Popen()
<br>
myProg.call("wolf", "-h")
<br>
</blockquote>
<br>
Even simpler, you only need:
<br>
<br>
from subprocess import call
<br>
myProg = call(["wolf", "-h"])
<br>
<br>
You need to put the command as the first entry of a list and each
<br>
argument as a separate entry
<br>
<br>
HTH,
<br>
<br>
<br>
</blockquote>
<br>
<div class="moz-signature">-- <br>
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<pre class="moz-signature" cols="76"> Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.01 Deg. W, 39.26 Deg. N) GMT-8 hr std. time)<span
style="font-weight: bold;"></span><b><b
style="color: rgb(204, 51, 204);" class="b"><span
style="color: rgb(255, 153, 255);"></span><span
style="font-family: monospace;"></span></b></b>
<span style="color: rgb(102, 0, 204);"></span><span
style="color: rgb(102, 0, 204);"></span>
<span style="color: rgb(102, 0, 204);"> </span><font
class="sqq"><span style="color: rgb(102, 0, 204);">“</span><span
class="sqq" style="color: rgb(102, 0, 204);">Life is one damn thing after another."
-- Mark Twain </span></font>
</pre>
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