Python - TCP Server

Question

I'm new in python. I've found a simple TCP Server's code and it works. The problem is: i'm not able to make a if...elif...else works. I think it's a mistake of value's type.

Here's my code (the program always do the else part):

while 1:
    data = clientsocket.recv(1024)
    tokens = data.split(' ',1)
    command = tokens[0]
    if not command:
        break
    else:
        if command == 1:
            try:
                camera.start_preview()
                time.sleep(10)
                camera.stop_preview()
            finally:
                camera.close()
        elif command == 2:
            print "Something"
        elif command == 3:
            print "something else"
        else:
            print data
            print tokens[0]
            print command
clientsocket.close()

It give me the result of the last else which is :

Or the number I send. Thanks in advance for your responses !

try command = int(tokens[0]) since the data received is a string and not int — Kobi K
– Kobi K, Commented Jun 25, 2014 at 15:06
@SebastienVoisard print out the value of data and finally of command, it will give you the answer. Even better, try to debug the code (using pdb or ipdb), and inspect the changes step by step). See pymotw.com/2/pdb — Jan Vlcinsky
– Jan Vlcinsky, Commented Jun 25, 2014 at 15:10
You were right, the type was not the same, thanks, it works now ! — Sébastien Voisard
– Sébastien Voisard, Commented Jun 25, 2014 at 15:47

jonrsharpe · Accepted Answer · 2014-06-25 15:08:10Z

3

command is a string, not an integer; you are comparing:

>>> '2' == 2
False

Instead, use:

...
tokens = data.split(' ', 1)
try:
    command = int(tokens[0])
except ValueError:
    break

if command == 1:
    ...

answered Jun 25, 2014 at 15:08

jonrsharpe

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