title: Python interface wifi.Cell.all(Interface) giving system error
body: <p>I am trying to connect to the wireless network using <a href="https://wifi.readthedocs.org/en/latest/index.html" rel="nofollow">wifi</a>. As per the documents I have written the code, but it gives system error that file not found. As I can see the argument description of the Cell.all() is interface but we are providing literal as argument. What might be the problem?</p>
  
  <pre><code>import time 
  import datetime
  from wifi import Cell, Scheme
  
  while True :
      print datetime.datetime.now()
      print Cell.all('wlan0')
      time.sleep(5)
  
  &gt;&gt;&gt;
  2015-01-25 12:38:43.784000
  
  Traceback (most recent call last):
    File "D:\Documents\Development\Script\AutoLogon.py", line 9, in &lt;module&gt;
  print Cell.all('wlan0')
    File "C:\Python27\lib\site-packages\wifi\scan.py", line 29, in all
  stderr=subprocess.STDOUT)
    File "C:\Python27\lib\subprocess.py", line 537, in check_output
    process = Popen(stdout=PIPE, *popenargs, **kwargs)
  File "C:\Python27\lib\subprocess.py", line 679, in __init__
    errread, errwrite)
  File "C:\Python27\lib\subprocess.py", line 896, in _execute_child
    startupinfo)
  WindowsError: [Error 2] The system cannot find the file specified
  &gt;&gt;&gt;
  </code></pre>