Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

36 lines (25 sloc) 1.078 kb
# Copyright 2002 by Jeffrey Chang. All rights reserved. This code is
# part of the Biopython distribution and governed by its license.
# Please see the LICENSE file that should have been included as part
# of this package.
# This module attempts to detect whether the internet is available.
# To use it, just insert "import requires_internet" into your Python
# code. If the internet is available, then the import statement
# succeeds. If it is not, then the statement will result in an
# ImportError exception.
AVAILABLE = None # Was the internet available the last time I checked?
TESTED = 0 # Have I checked before? If so, just re-use the result.
# I'm going to check for internet availability
RELIABLE_DOMAIN = "biopython.org"
if not TESTED:
# Not thread-safe...
TESTED = 1
import socket
try:
socket.getaddrinfo(RELIABLE_DOMAIN, 80, socket.AF_UNSPEC, socket.SOCK_STREAM)
except socket.gaierror, x:
AVAILABLE = 0
else:
AVAILABLE = 1
if not AVAILABLE:
raise ImportError, "internet not available"
Jump to Line
Something went wrong with that request. Please try again.