Question

Having 2 python programs , host1.py and host2.py which run simultaneously and communicate via socket such that –

host1.py has reciveSock = socket(AF_INET,SOCK_DGRAM)

and host2.py has sendSocket = socket(AF_INET,SOCK_DGRAM) .

Both the socket’s are binding each other .

At host1.py has –

try:
    msgBacked = reciveSock.recv(256)
except:
    pass
if( msgBacked is None):
    print "isNone!"

And indeed it prints isNone! mean msgBacked is a None .

All the send’s from host2.py to host1.py are in a type sendSocket.send("ACK") so that there is a value in the sent string which tranported to host1.py .

So how this msgBacked could be None ?

Answer 1

Most likely receiveSock.recv is throwing a timeout exception, and msgBacked was previously set to None. Try removing the try .. except and see what happens.