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#6430

Python 3

Simple TCP Echo server in Python

import SocketServer

class MyTCPHandler(SocketServer.BaseRequestHandler):
    """                                                                                                                                                             
    The RequestHandler class for our server.                                                                                                                        
                                                                                                                                                                    
    It is instantiated once per connection to the server, and must                                                                                                  
    override the handle() method to implement communication to the                                                                                                  
    client.                                                                                                                                                         
    """

    def handle(self):
        # self.request is the TCP socket connected to the client                                                                                                    
        self.data = self.request.recv(1024).strip()
        print "%s wrote:" % self.client_address[0]
        print self.data
        # just send back the same data, but upper-cased                                                                                                             
        self.request.send(self.data.upper())

if __name__ == "__main__":
    HOST, PORT = "localhost", 9999

    # Create the server, binding to localhost on port 9999                                                                                                          
    server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler)

    # Activate the server; this will keep running until you                                                                                                         
    # interrupt the program with Ctrl-C                                                                                                                             
    server.serve_forever()
https://snipt.net/embed/2f911d8f633ad4a1df497ab25d05a4c7/
https://snipt.net/raw/2f911d8f633ad4a1df497ab25d05a4c7/
2f911d8f633ad4a1df497ab25d05a4c7
python3
Python 3
29
2014-04-23T06:32:31
True
False
/api/public/snipt/6430/
simple-tcp-echo-server-in-python
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a></pre></div></td><td class="code"><div class="highlight"><pre><span id="L-1"><a name="L-1"></a><span class="kn">import</span> <span class="nn">SocketServer</span> </span><span id="L-2"><a name="L-2"></a> </span><span id="L-3"><a name="L-3"></a><span class="k">class</span> <span class="nc">MyTCPHandler</span><span class="p">(</span><span class="n">SocketServer</span><span class="o">.</span><span class="n">BaseRequestHandler</span><span class="p">):</span> </span><span id="L-4"><a name="L-4"></a> <span class="sd">&quot;&quot;&quot; </span> </span><span id="L-5"><a name="L-5"></a><span class="sd"> The RequestHandler class for our server. </span> </span><span id="L-6"><a name="L-6"></a><span class="sd"> </span> </span><span id="L-7"><a name="L-7"></a><span class="sd"> It is instantiated once per connection to the server, and must </span> </span><span id="L-8"><a name="L-8"></a><span class="sd"> override the handle() method to implement communication to the </span> </span><span id="L-9"><a name="L-9"></a><span class="sd"> client. </span> </span><span id="L-10"><a name="L-10"></a><span class="sd"> &quot;&quot;&quot;</span> </span><span id="L-11"><a name="L-11"></a> </span><span id="L-12"><a name="L-12"></a> <span class="k">def</span> <span class="nf">handle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> </span><span id="L-13"><a name="L-13"></a> <span class="c"># self.request is the TCP socket connected to the client </span> </span><span id="L-14"><a name="L-14"></a> <span class="bp">self</span><span class="o">.</span><span class="n">data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">recv</span><span class="p">(</span><span class="mi">1024</span><span class="p">)</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span> </span><span id="L-15"><a name="L-15"></a> <span class="nb">print</span> <span class="s">&quot;%s wrote:&quot;</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">client_address</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> </span><span id="L-16"><a name="L-16"></a> <span class="nb">print</span> <span class="bp">self</span><span class="o">.</span><span class="n">data</span> </span><span id="L-17"><a name="L-17"></a> <span class="c"># just send back the same data, but upper-cased </span> </span><span id="L-18"><a name="L-18"></a> <span class="bp">self</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">send</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">data</span><span class="o">.</span><span class="n">upper</span><span class="p">())</span> </span><span id="L-19"><a name="L-19"></a> </span><span id="L-20"><a name="L-20"></a><span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span> </span><span id="L-21"><a name="L-21"></a> <span class="n">HOST</span><span class="p">,</span> <span class="n">PORT</span> <span class="o">=</span> <span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="mi">9999</span> </span><span id="L-22"><a name="L-22"></a> </span><span id="L-23"><a name="L-23"></a> <span class="c"># Create the server, binding to localhost on port 9999 </span> </span><span id="L-24"><a name="L-24"></a> <span class="n">server</span> <span class="o">=</span> <span class="n">SocketServer</span><span class="o">.</span><span class="n">TCPServer</span><span class="p">((</span><span class="n">HOST</span><span class="p">,</span> <span class="n">PORT</span><span class="p">),</span> <span class="n">MyTCPHandler</span><span class="p">)</span> </span><span id="L-25"><a name="L-25"></a> </span><span id="L-26"><a name="L-26"></a> <span class="c"># Activate the server; this will keep running until you </span> </span><span id="L-27"><a name="L-27"></a> <span class="c"># interrupt the program with Ctrl-C </span> </span><span id="L-28"><a name="L-28"></a> <span class="n">server</span><span class="o">.</span><span class="n">serve_forever</span><span class="p">()</span> </span></pre></div> </td></tr></table>
python, server, tcp