Python 上下文关系

import socket
import contextlib

@contextlib.contextmanager
def con(host,port):
    sk = socket.socket()
    sk.bind((host,port))
    sk.listen(5)
    try:
        print ("auto connect")
        yield
        print ("============")
    finally:
        print ("finally close")
        sk.close()

with con(‘127.0.0.1‘,8888) as sock:
    print ("sock auto close")执行结果：

auto connect
sock auto close
============
finally close