Problem with Python code under Linux

dmsynck · 10-25-2007, 07:37 PM

Hi all,

I am working on moving a small Python script from Windows to Linux and am running into a problem with one section of the code. Here is the snippet that is giving me problems.

Code:

for x in Dict1.keys():
        return_code = subprocess.call(["/bin/ping -q -c 3",Dict1[x]])
        if return_code == 0:
            f.write(str(roomNo[i]) + ": \t " + str(Dict1[x]) + "\t Pass \n")
            i = i + 1
            num_pass = num_pass + 1
        elif return_code == 1:
            f.write(str(roomNo[i]) + ": \t " + str(Dict1[x]) + "\t Fail \n")
            i = i + 1
            num_fail = num_fail + 1
        else:
            pass

This code, modified accordingly, runs just fine under windows. Under Linux, it has a problem with the argument to the subprocess call. Here is the traceback:

Code:

Traceback (most recent call last):
  File "./IPinger_Dev.py", line 323, in ?
    main()
  File "./IPinger_Dev.py", line 304, in main
    testIP()
  File "./IPinger_Dev.py", line 129, in testIP
    return_code = subprocess.call(["/bin/ping -q -c 3",Dict1[x]])
  File "/usr/lib/python2.4/subprocess.py", line 412, in call
    return Popen(*args, **kwargs).wait()
  File "/usr/lib/python2.4/subprocess.py", line 542, in __init__
    errread, errwrite)
  File "/usr/lib/python2.4/subprocess.py", line 975, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Thanks in advance

dmsynck

angrybanana · 10-25-2007, 11:18 PM

separate each item.

Code:

return_code = subprocess.call(["/bin/ping", "-q", "-c", "3",Dict1[x]])

or join them all up into one string and use shell=True

Code:

return_code = subprocess.call(" ".join(["/bin/ping -q -c 3",Dict1[x]]), shell=True)

Read this for more info on the difference:
http://docs.python.org/lib/node529.html

ps:
you don't need the .keys(), this should iterate over the dictionary keys just fine:

Code:

for x in Dict1: