title: Python raises AttributeError when attempting to send ARP request on Raspberry Pi 3
body: <p>I'm working on a program that automatically scans the local network using ARP requests on a Raspberry Pi 3. The code works fine on my computer, but when I try to run it on my Raspberry Pi, it fails with the following error:</p>
  
  <pre><code>File "/usr/local/lib/python2.7/dist-packages/scapy/base_classes.py", 
  line 241, in __getattr__
      raise AttributeError(attr)
  AttributeError: who_has
  </code></pre>
  
  <p>The code that raises this error is as follows:</p>
  
  <pre><code>from scapy import *
  
  result, unanswered = sr(ARP(op=ARP.who_has, psrc="192.168.0.79", pdst="192.168.0.1"), timeout=3)
  </code></pre>