python的socket库可以检测端口是否开放。
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import socket;
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = sock.connect_ex(('127.0.0.1',80))
if result == 0:
print "Port is open"
else:
print "Port is not open"这里sock.connect_ex()方法尝试连接，如果连接成功返回0。