aF. aF. - 7 months ago 10
Python Question

Checking network connection

I want to see if I can access an online API, but for that I need to have Internet access.

How can I see if there's a connection available and active using Python?

Answer

Perhaps you could use something like this:

import urllib2

def internet_on():
    try:
        response=urllib2.urlopen('http://74.125.228.100',timeout=1)
        return True
    except urllib2.URLError as err: pass
    return False

74.125.228.100 is one of the IP-addresses for google.com. Change http://74.125.228.100 to whatever site can be expected to respond quickly. Using a numerical IP-address avoids a DNS lookup, which may block the urllib2.urlopen call for more than a second. Thanks to @rzetterberg for pointing this out.

By specifying the timeout=1 parameter, the call to urlopen will not take much longer than 1 second even if the internet is not "on".