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    Ä£¿éµÄ˵Ã÷£ºThis module provides a high level interface to packet capture systems.All packets on the network, even those destined for other hosts, areaccessible through this mechanism.
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 class pcap(__builtin__.object)
 pcap(name=None, snaplen=65535, promisc=True, immediate=False, timeout_ms=None) -> packet capture object¡£Open a handle to a packet capture descriptor.
name      -- name of a network interface or dumpfile to open,
               or None to open the first available up interface
snaplen   -- maximum number of bytes to capture for each packet
promisc   -- boolean to specify promiscuous mode sniffing
immediate -- disable buffering, if possible
timeout_ms -- requests for the next packet will return None if the timeout
                    (in milliseconds) is reached and no packets were received
                  (Default: no timeout)
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