python标准库 － socket

地址簇(address family)
socket.AF_UNIX # (UNIX Domain Sockets)
socket.AF_INET # ipv4
socket.AF_INET6 # ipv6

套接字类型(socket type)
socket.SOCK_STREAM # tcp
socket.SOCK_DGRAM # udp
socket.SOCK_RAW
socket.SOCK_RDM
socket.SOCK_SEQPACKET