錯誤 - 全局名稱'SOL_SOCKET未定義

Question

我試圖創建一個使用p2p（點對點）連接的基本即時消息程序，因此它不需要服務器。我很確定沒有錯，但每次運行我創建的客戶端程序時，都會出現以下錯誤： s.setsockopt（SOL_SOCKET，SO_REUSEADDR，1） NameError：全局名稱'SOL_SOCKET'未定義 這裏是程序：

import socket 

def Receiver(): 

    # Create socket that supports IPv4, TCP Protocol 
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
    print "Socket created." 
    # Requests for IP of host (DNS) 
    dns = "localhost" 
    HOST = '' 
    PORT = 25395 
    try: 

     s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) 
    except socket.error as serror: 
     print "socket error" 
    s.bind((HOST, PORT)) # Listens on all interfaces... 
    print 'Listening on port 25565' 
    s.listen(True) # Listen on the newly created socket... 
    conn, addr = s.accept() 
    print 'Connected in port 25565' 
    data = conn.recv(1024) 
    print data 
    s.close() 
def Sender(): 

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
    dns = "localhost" 
    HOST = socket.gethostbyname(dns) 
    port = 25565  
    # Connect to server 
    s.connect((host,port)) 

    print "Socket connected to " + dns + " on IP " + host 

    # Assign message to be sent to server to a variable 
    message = raw_input("Message to be sent to server: ") 

    #Send the actual message to server 
    s.sendall(message) 
    print "Message sent successfully" 
    s.close() 


input = raw_input('S is send, R is receive: ') 
if input == 's': 
    Sender() 
if input == 'r': 
    Receiver() 

我試圖消除s.setsockopt（SOL_SOCKET，SO_REUSEADDR，1），但它告訴我，我不能使用2個插槽的同一個端口上時，有使用同一端口不是2個插座。

Answer 1

在您的代碼：

s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) 

不喜歡：

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 
    #   ^^^^ added   ^^^ 

，因爲你socket進口的，檢查下面的代碼片段：

>>> import socket 
>>> SOL_SOCKET 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
NameError: name 'SOL_SOCKET' is not defined 
>>> socket.SOL_SOCKET 
1