python check internet connection

1import urllib.request
2
3def internet_on():
4    try:
5        urllib.request.urlopen('http://216.58.192.142', timeout=2)
6        return True
7    except:
8        return False

1try:
2    import httplib
3except:
4    import http.client as httplib
5
6def have_internet():
7    conn = httplib.HTTPConnection("www.google.com", timeout=5)
8    try:
9        conn.request("HEAD", "/")
10        conn.close()
11        return True
12    except:
13        conn.close()
14        return False
15# Code by Ivelin on Stack overflow

1import urllib2
2
3def internet_on():
4    try:
5        urllib2.urlopen('http://216.58.192.142', timeout=1)
6        return True
7    except urllib2.URLError as err: 
8        return False