مشكلة اثناء تعريف مكتبة scapy

لما باقي اعرف المكتبة بيجيلي الايرور دة 

from scapy.all import *

Traceback (most recent call last):
File “”, line 1, in
from scapy.all import *
File “C:\Python27\lib\site-packages\scapy\all.py”, line 16, in
from arch import *
File “C:\Python27\lib\site-packages\scapy\arch\__init__.py”, line 80, in
from windows import *
File “C:\Python27\lib\site-packages\scapy\arch\windows\__init__.py”, line 23, in
from scapy.arch import pcapdnet
File “C:\Python27\lib\site-packages\scapy\arch\pcapdnet.py”, line 30, in
import pcapy as pcap
ImportError: No module named pcapy

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