The optparse of the Python module

Reference:

• Http://www.cnblogs.com/captain_jack/archive/2011/01/11/1933366.html
• Https://docs.python.org/2/library/optparse.html

eg

#This is the blocking Get poetry now! client.Importdatetime, Optparse, SocketdefParse_args (): Usage="""usage:%prog [options] [hostname]:p ort ... This is the Get poetry now! Client, blocking edition. Run it like This:python get-poetry.py port1 port2 port3 ... If you is in the base directory of the Twisted-intro package,you could run it like This:python Blocking-client/get-poet ry.py 10001 10002 10003to grab poetry from servers on ports 10001, 10002, and 10003.Of course, there need to be servers Li Stening on those portsfor."""Parser=Optparse. Optionparser (usage) _, addresses=Parser.parse_args ()if  notaddresses:Printparser.format_help () parser.exit ( )defparse_address (addr):if ':'  not inchAddr:host='127.0.0.1'Port=AddrElse: Host, Port= Addr.split (':', 1)        if  notport.isdigit (): Parser.error ('Ports must be integers.')        returnhost, int (port)returnmap (parse_address, addresses)defGet_poetry (address):"""Download a piece of poetry from the given address."""sock=Socket.socket (socket.af_inet, socket. SOCK_STREAM) Sock.connect (address) poem="'     whileTrue:#This was the ' blocking ' call in this synchronous program.        #The recv () method would block for an indeterminate period        #Of time waiting for bytes to is received from the server.Data= SOCK.RECV (1024)        if  notdata:sock.close () BreakPoem+=DatareturnPoemdefformat_address (address): Host, Port=Addressreturn '%s:%s'% (hostor '127.0.0.1', Port)defmain (): Addresses=Parse_args () elapsed=Datetime.timedelta () forI, AddressinchEnumerate (addresses): #http://blog.csdn.net/suofiya2008/article/details/5603861 addr_fmt=format_address (address)Print 'Task%d:get poetry from:%s'% (i + 1), addr_fmt) Start=Datetime.datetime.now ()#Each execution of ' get_poetry ' corresponds to the        #execution of one synchronous task in Figure 1 here:        #Http://krondo.com/?p=1209#figure1Poem=get_poetry (address) time= Datetime.datetime.now ()-Start msg='Task%d:got%d bytes of poetry from%s in%s'        PrintMsg% (i + 1), Len (poem), addr_fmt, time) elapsed+= TimePrint 'Got%d poems in%s'%(Len (addresses), elapsed)if __name__=='__main__': Main ()

The optparse of the Python module