popen3 Object

[Graham Ashton]

On Tue, 12 Feb 2002 13:07:30 +0000, DelPiccolo Ivano wrote:

> How can I print the stdout of the popen3
> 
> exemple :
> 
> fileobjet = os.popen3("ls -la", "true" ) print ??????????

Using Python 2.1 on Linux:

ratchet% python
Python 2.1 (#8, Aug 22 2001, 16:46:14) 
[GCC 2.95.2 20000220 (Debian GNU/Linux)] on linux2
Type "copyright", "credits" or "license" for more information.
>>> import os
>>> os.popen3("echo foo", "t")
(<open file '(fdopen)', mode 'w' at 0x8134478>, <open file '(fdopen)',
mode 'r' at 0x8134168>, <open file '(fdopen)', mode 'r' at 0x8132e00>)

So we know that popen3 returns three open file objects, the first one
open for writing and the second two for reading. If you check the docs 
you'll see that they are the child's stdin, stdout and stderr. So,
returning to the interactive python session:

>>> stdIn, stdOut, stdErr = os.popen3("echo foo")
>>> while 1:
...     line = stdOut.readline()
...     if line == "": 
...         break
...     else:
...         print line,
... 
foo
>>>

Does that help any?

-- 
Graham