Python subprocess.check_output()

Question

mystring = subprocess.check_output(["sudo iwlist wlan0 scan"], universal_newlines=True)
word = 'Devsign2G'
print (mystring)
print (word)

if word in str(mystring):
    print ('success')

-error message-

   Traceback (most recent call last):
      File "test.py", line 52, in 
        mystring = subprocess.check_output(["sudo iwlist wlan0 scan"], universal_newlines=True)
      File "/usr/lib/python2.7/subprocess.py", line 212, in check_output
        process = Popen(stdout=PIPE, *popenargs, **kwargs)
      File "/usr/lib/python2.7/subprocess.py", line 390, in __init__
        errread, errwrite)
      File "/usr/lib/python2.7/subprocess.py", line 1024, in _execute_child
        raise child_exception
    OSError: [Errno 2] No such file or directory

what is the problem?

Armali · Accepted Answer · 2018-11-15 07:37:00Z

2

what is the problem?

The OSError: [Errno 2] No such file or directory refers to the subprocess command which is to be executed.

The program arguments must be passed individually in the sequence, so change

["sudo iwlist wlan0 scan"]

to

["sudo", "iwlist", "wlan0", "scan"]

edited Nov 15, 2018 at 7:37

answered Nov 15, 2018 at 7:27

Armali

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Comments

tifi90 · Accepted Answer · 2018-11-15 07:17:01Z

0

It looks like your code is using a file called "subprocess" located here: /usr/lib/python2.7/subprocess.py

But the file or directory isn't there. You can change the dir or put the file in the correct folder.

If it's an packaged. Did you install the package with pip or sth? Is it imported?

answered Nov 15, 2018 at 7:17

tifi90

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2 Comments

devLupin Over a year ago

This package is a built-in package in Python 2.7. I entered the command(sudo apt-get install subprocess) but the answer is "E: Invalid operation subprocess"

toti08 Over a year ago

The package is already installed, as it can be seen from the traceback. The file subprocess is there, so this is not the source of the problem.

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