Python subprocess.check_output() - subprocess

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?

Answer 1

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"]

Answer 2

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?