continue by sock.recv() when empty python

Question

I have a thread running that is looking for data from a socket connection. When it is empty it just sits there as I found it is supposed to, but I would like to pass by this when it is empty. I found that the select module should be able to do it, but now it just sits at the select line instead. I have tried this below from some research, but like I said, now instead of stopping at the data = sock.recv, it stops at the first line. Any ideas? Thanks.

while True:
        readable, writable, exceptional = select.select([sock], [], [])
        if readable:
            data = sock.recv(1024)
        else:
            do something

glglgl · Accepted Answer · 2014-07-10 15:26:43Z

1

As you could have read in the documentation, select.select() takes an optional 4th argument, taking a timeout value.

If the timeout passes without sock becoming readable, readable is empty.

You can try something like

while True:
    readable, writable, exceptional = select.select([sock], [], [], 1.0)
    if readable:
        data = sock.recv(1024)
    else:
        print "nothing yet"

edited Jul 10, 2014 at 15:26

answered Jul 10, 2014 at 15:14

glglgl

91.5k13 gold badges157 silver badges230 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

user3582887 Over a year ago

readable, writable, exceptional = select.select([sock], [], [], timeout=1.0) TypeError: select() takes no keyword arguments - I did try that but get this error

SiHa Over a year ago

That means you can't use a keyword argument, just pass the timeout instead: readable, writable, exceptional = select.select([sock], [], [], 1.0).

glglgl Over a year ago

@user3582887 Ok, then I misunderstood that part of the documentation, but you already had the idea to try select.select([sock], [], [], 1.0) afterwards, didn't you?

glglgl Over a year ago

@SiHa As "the optional timeout argument specifies a time-out as a floating point number in seconds", as the doc states, it is unlikely it would do so.

user3582887 Over a year ago

Thanks all, sorry, didn't have that idea, didn't understand the error, but appreciate all the input.

Collectives™ on Stack Overflow

continue by sock.recv() when empty python

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related