Python converting from tuple to string

Question

I know for many of you that would be easy thing to do, but for me no. So I'm trying to output data from shell, but I'm stucked when I have to transform it into string. I tried with for , but didn't work. So basically, what I'm trying is: for each new line in my shell, output new line. I'll give an example - the free -m command. Its output is

  total       used       free     shared    buffers     cached
  Mem:           144        512        111          0          0        121
  -/+ buffers/cache:         23        232
  Swap:            0          0          0

So, what I wrote so far is:

import commands
foo...
sout = commands.getstatusoutput(inp)
    return ' '.join(str(line) for line in sout)
foo...

But the output is only one line (the first line - total, used, free, shared etc)

and I want new line for each new line like the output in the shell. If I leave it without .join it outputs something like

(0, '             total       used       free     shared    buffers     cached\nMem:           512        144        368          0          0        121\n-/+ buffers/cache:         21        234\nSwap:            0          0          0')

and since I want it to be a string, I even tried '\\n'.join , but it outputed only 0 (wtf). Any ideas?

Answer 1

You could also use os.popen which is much more convenient.

print os.popen('free -m').read()

You might want to read this thread to acquire a good overview of the options available to run shell commands from within python Calling an external command in Python

Answer 2

The entire string is in the tuple, with line breaks and everything, so I suppose all you need to do is:

print sout[1]

Assuming that sout is the tuple you show in your question:

(0, '             total       used       free     shared    buffers     cached\nMem:           512        144        368          0          0        121\n-/+ buffers/cache:         21        234\nSwap:            0          0          0')

Answer 3

just make a check for newline character and then insert a new line character in your output. here actually you getting input as a whole. hope it helps

Answer 4

There is another way you can get the same result:

    from subprocess import Popen, PIPE
    // Create a subprocess and then interact with the process by reading data from 
    // stdout, untill the end-of-file is reached. Since communicate return tuple 
    // in the form of stdout, stderr), Capture only the output.

    (result, errcode) = Popen('free -m', stdout = PIPE, shell = True).communicate()
    print result