python - How do I get the "except" to trigger? -


we're learning sockets in networking , we've been tasked fill out template in python (teacher's using python2.x while i'm using python3.x).

    # import socket module socket import *  # create tcp server socket #(af_inet used ipv4 protocols) #(sock_stream used tcp) serversocket = socket(af_inet, sock_stream)  # assign port number serverport = 6789  # bind socket server address , server port serversocket.bind(('',serverport))  # listen @ 1 connection @ time serversocket.listen(1)   # server should , running , listening incoming connections while true:     print ("ready serve...")      # set new connection client     connectionsocket, addr = serversocket.accept()      # if exception occurs during execution of try clause     # rest of clause skipped     # if exception type matches word after except     # except clause executed     try:         # receive request message client         message = connectionsocket.recv(4096).decode()         # extract path of requested object message         # path second part of http header, identified [1]         filename = message.split()[1]         # because extracted path of http request includes          # character '\', read path second character          f = open(filename[1:])         # store entire contenet of requested file in temporary buffer         outputdata = f.read()         # send http response header line connection socket         connectionsocket.send(("http/1.1 200 ok \r\n").encode())          # send content of requested file connection socket         in range(0, len(outputdata.encode())):               connectionsocket.send(outputdata.encode())           connectionsocket.send(("\r\n").encode())           # close client connection socket         connectionsocket.close()          break      except ioerror:         # send http response message file not found         connectionsocket.send(("http/1.1 404 not found\r\n").encode())         connectionsocket.send(("<html><head></head><body><h1>error. try again</h1></body></html>\r\n").encode())         # close client connection socket         connectionsocket.close()          break  #close socket serversocket.close()

the file i'm reading .htm file:

<html><head><title>html test file</title></head><body><h1>trying frickin' program work</h1></body></html>

when run program , enter: localhost:6789/testfile.htm, prints file contents on , on , gives me error message: line 34, indexerror: list index out of range. edit: break takes care of error message, file still being printed on , over

what doing wrong?

edit #2: i'm trying error handling, merely states no data sent when type in file doesn't exist (i.e. localhost:6789/test.htm). how error message print?

  in range(0, len(outputdata.encode())):           connectionsocket.send(outputdata.encode())

this code:

  • encodes text twice
  • loops 121 times (which length of file posted, encoded ascii or utf-8)
  • sends entire file each of 121 times

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