如何查socket的listen的帮助文档？

listen是sockettype类型的方法函数，故查帮助
help(模块.类.方法)
 help(socket.SocketType.listen)
In [28]: help(socket.SocketType.listen)
Help on method listen:
listen(...) unbound socket._socketobject method
    listen(backlog)
    Enable a server to accept connections. The backlog argument must be at
    least 0 (if it is lower, it is set to 0); it specifies the number of
    unaccepted connections that the system will allow before refusing new
    connections.