linux - Python Import issues: AttributeError: 'NoneType' object has no attribute 'fields' -

i'm trying write little python script on linux embedded scapy lib. on osx or linux box don't have problem this:

from scapy.all import ip, sniff scapy.layers import http import urllib, re  def process_tcp_packet(packet):      http_layer = packet.getlayer(http.httprequest)     ip_layer = packet.getlayer(ip)     url = str('{1[path]}'.format(ip_layer.fields, http_layer.fields))     if url:         url = urllib.unquote(url).decode('utf8')         print re.findall(r'(https?://\s+lh1)', url)   sniff(filter="tcp , host hostexample.com", prn=process_tcp_packet) 

the scapy folder looks this:

enter code here /scapy   __init__.py   all.py   ...   /layers    __init__.py    http.py    dhcp.py    ... 

when start script, seems modules imported line:

url = str('{1[path]}'.format(ip_layer.fields, http_layer.fields)) 

return error:

attributeerror: 'nonetype' object has no attribute 'fields' -->end of python script error report<-- 

any appreciated! thanks!

"print http_layer" on osx-box:

get path: someurl.... http-version: http/1.1 host: hostexample.com user-agent: mozilla/5.0 (macintosh; intel mac os x 10.10; rv:37.0)    gecko/20100101 firefox/37.0 accept: image/png,image/*;q=0.8,*/*;q=0.5 accept-language: de,en-us;q=0.7,en;q=0.3 accept-encoding: gzip, deflate referer: http://hostexample/someurl connection: keep-alive 

on embedded: "none"