python - ARP missing from the module scapy -

i trying use scapy in python while try import scapy import scapy fine line scapy.arp() causes a

traceback (most recent call last): file "", line 1, in attributeerror: 'module' object has no attribute 'arp'

a dir(scapy) produces '['__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__']' might problem here ? need install packages separately if yes how ?

got , version v.2 onward should used scapy.all import *