Re: capturing output of command line in an array


On Oct 31, 2007, at 11:01 AM, amjadcsu@xxxxxxxxx wrote:

I am trying to execute a command using os.system. this command lists
the number of nodes alive in a cluster. I would like to capture the
output in list/array in python. IS it possible.?/

Here is my command
gstat -a
node13 2 ( 0/ 56) [ 0.00, 0.00, 0.00] [ 0.0, 0.0,
0.1, 99.9, 0.0] OFF
node12 2 ( 1/ 63) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.8, 0.0] OFF
node8 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 47.5, 0.0,
2.8, 49.7, 0.0] OFF
node2 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node1 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node7 2 ( 1/ 58) [ 0.99, 0.97, 0.91] [ 49.8, 0.0,
0.6, 49.7, 0.0] OFF
node11 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.8, 49.6, 0.0] OFF
node4 2 ( 1/ 59) [ 1.00, 1.00, 0.93] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node10 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 46.7, 0.0,
3.7, 49.7, 0.0] OFF
node5 2 ( 1/ 59) [ 1.00, 1.00, 0.92] [ 49.8, 0.0,
0.4, 49.7, 0.0] OFF
node6 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 49.5, 0.0,
0.9, 49.7, 0.0] OFF

I would like to have an array where each element contains the nodes

for example
a=[node13,node12,node2,node8,node1,node7,node 11]

any help would be appreciated


You might try os.popen to read in the output of your command.

It would be helpful to have more information about what you'd like to do with your list. Do you just want to put the text of the individual node lines from gstat into the list? If so, os.popen should work for you. Or do you need to parse the lines and store them in, say dictionaries? Tuples? If you need to parse it, you could use module re, or even just string methods, depending on what you're trying to do . . . .

HTH,

---
Lee Capps
Technology Specialist
CTE Resource Center
lcapps@xxxxxxxxxxxxxxx



.

Relevant Pages