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 Armali · Accepted Answer · 2018-11-15T07:27:35

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"]

Python subprocess.check_output()

2 Answers